[HTC One X+] KenjiS:
Because I promised ;)

Quick background: I've had iPhones until earlier this year when i took the plunge and nabbed an Unlocked Galaxy Nexus GSM, Great phone, but some things with it I just couldnt get past (16gb of storage and the EH audio amplification...Also i want fond of 4.2 on it) which lead me to search for another phone, Tried the Galaxy S3 but was disappointed and returned it, And now about a weekish or so ago I got myself the One X+, So lets delve into my opinion on the device for anyone on the fence

First Impressions, Build, Ergonomics and Screen

The build of the One X+ is fantastic, Far better than the S3 or Galaxy Nexus, it feels nice solid and most importantly for a $200-on-contract smartphone, premium, The grippy texture to the finish makes it a delight to hold and I never feel like im going to drop the bloody thing at the drop of a hat, The Capacitive buttons are also in my opinion much nicer than the hard button on the S3 (One of the major stumbling blocks with the S3 was the fact i found that button WAY too hard to work) Though I think the Galaxy Nexus' on screen buttons are still the most elegant solution... If I had one little complaint in regards to the ergonomics its that the volume buttons sit flush and undefined on the chassis of the phone, which has taken me a bit to get used to, Id prefer them to be raised a bit, but its a minor complaint. Overall the fit and finish of the phone is the best of any other phone I've ever owned, it feels solid and like its going to hold up to 2 years of use

Moving on, the screen is one of the most important bits of ANY smartphone and the One X+ doesnt disappoint, its easily got the nicest screen I've ever seen on a smartphone (And i did LOVE the AMOLED on my GNex so thats high praise!) its big, its bright, colors are saturated and the black level is nothing to scoff at, Albeit not as inky black as an AMOLED, Text is sharp and easily readable as well, and unlike the AMOLED screen on my GNex it doesnt chug my battery flat, it also stays looking nice even at lower brightness levels, The multitouch on it works well and accurately... Other nice things are the nicely beveled edges at the screen which makes swiping, say to another page of the homescreen or to move icons from one screen to another, a real treat and the fact it stays pretty clean and comes clean easily (Its not a fingerprint magnet the way my iphone or the S3 was, The S3 was actually terrible because i couldnt clean the fingerprints off worth a darn...)

Sense/Software

This is my first experience with Sense and only the second Skinned android version I've used and I gotta say I'm in the group that likes Sense, I get the reasons folks dislike it, but I'm finding I actually prefer many aspects of it over stock Android, in particular I do like the messaging app on it which just seems to work a bit better than the one on my GNex, and I do rather like more than one of the widgets it comes with (The small 4x1 Weather + Clock widget for instance) but I do see how these things could drain the battery or processor... I like how it asked me after dismissing one tutorial if i wanted it to keep bringing tutorials up and when i said no it never brought up another one (Unlike Touchwiz which would NOT stop bringing up tutorials even after i told it to knock it off)

The music app has rapidly become my favorite music app, I just like it, I dont like Google Play Music and Doubletwist had its problems in my opinion (Namely it tended to mess up if someone sent me a text or called me and wouldnt resume playing until i completely exited it and reloaded it, Not to mention it did NOT play well with 4.2, also the random thing i had to toggle on and off a few times everytime i started played music or it just continued the same "random" assortment of songs from the last play through..) by comparison the Sense music app just works better, looks pretty attractive and is easy for me to navigate, Also the included ringtone maker is a VERY nice touch that removed the need to install an app to do so...

The phone and Calendar apps are also very very nice, far better than the stock Android counterparts.. I love how the lock screen works as well with only ONE complaint, I dont think theres a way to launch Google Now from the lock screen... (If you know a way please tell me)

Google Now is better than it was on the GNexus shockingly, it transcribes my voice a lot quicker and more accurately than my GNex ever did..

I pretty much disabled all the AT&T crapware on my One X+ as soon as I got it, and I recommend you do as well, I know from many reports here one of the apps will chew up your battery if you dont disable it so yeah, The only ATT App I have on there and use is the Visual Voicemail one, Beyond that theres a demo of Mass Effect Infiltrator installed which is actually nice, its a game I bought on a friend's iPad and while I liked the concept, their old iPad ran it like junk and i felt the game was more suited to a phone screen over a tablet, Im not sure I'll drop $3.99 to unlock the full version, but as a demonstration of what the Tegra 3 could do in terms of graphics I found it a lovely demonstration

The stock browser is pretty nice as well and supports flash, Performance on it is VERY good, Seems on par with my Flash-browser of choice on my GNex (Dolphin) theres a really stupid and annoying toolbar enabled by default but 5 seconds in the settings menu banishes it to nothingness, Of course for non-flash sites I use Chrome, but the stock browser is the nicest stock browser I've ever used

About the only complaint i can throw at Sense is the keyboard, Which is pretty bad for me personally, Lots of typing errors and problems... But to be honest thats a minor complaint given how many alternate keyboards there are for Android

Performance

Performance wise this phone is a powerhouse, I have not had any issues with it stuttering, slowing down or anything no matter how hard i push it, No games have had noticable framerate problems (The GNex had problems with a couple games I played) the interface works smooth and buttery and it definitely feels like the most powerful Android device I've owned, Flash works smooth and buttery and gives me no issues as well which is VERY nice

Gaming I havnt found a single game it cant run perfectly(Albeit, i havnt done TOO much gaming on it)

As for other performance, the radio and antenna seem to be excellent, Unlike the S3 my One X+ doesnt hop on and off between HSPA+ and LTE every 2 seconds schizophrenically (Which made my S3 lose 20% of its battery in a 20 minute long errand and signalled the final nail in the coffin that lead me to return it), My One X+ hasnt lost connection even when I've taken it to the places I know have poor coverage so I'm quite happy with that bit of it

LTE performance will vary on your area but I get around 8mbps in my house (Which is 2-bar bordering the edge of LTE territory) to a high of 36mbps i got when i was out of the house at a 4-bar LTE location, Which is certainly nothing to scoff about, Wi-Fi works well for me, and I've yet to notice any problems with my Wi-Fi dropping at night or when its been locked for a long time like other users have reported...

Call quality is excellent, People are loud and clear, The speakerphone is also the first one i've found i can actually USE in a car and hear the person...

Camera

I'm the worst person to ask about camera quality on smartphones, For what I use them for even the "Bad" Galaxy Nexus camera was great for me, I carry my EOS 7D with me just about everywhere so if I want to take a nice picture I will pull that out instead..

That said, the cameras are very nice, I love how responsive it is with pretty much no shutter lag, it focuses quickly and very accurately and tends to do a good job with exposure as well, Photos have a good amount of detail to them and skintones are rendered pleasingly, Theres plenty of artsy filters if thats your thing as well, Only complaint is the focal length of the front facing camera seems a bit long for a self portrait, i have more problems framing it than with other smartphones I've owned, But the quality is also far superior to the other phones I've had

The stock sound effects for it are REALLY FREAKING ANNOYING however

Audio Quality

Obviously one big reason I picked up the One X+ was to get something with better audio quality than the GNex, The GNex isnt THAT shabby, but it does lack "oomph" and struggled to drive even my mobile headphones (I had to have it cranked to 100% all the time to get them decently audible and even then it was eh...) Volume+ helped a bit but 4.2 broke Volume+ leaving me in a bit of a rut...I also personally felt it made the phone sound "Strained" at times to deliver the volume i desired... The external speaker was also frequently barely audible, I usually heard the phone vibrating over the actual ringer...

Thankfully the One X+ is worlds apart from the GNex in that department, The external speaker is LOUD and easily heard, its also of surprisingly good quality and is actually one of the best little built in speakers I've heard, it also has a good amount of "depth" to it and renders low frequencies admirably for what it is, Overall the external speaker impressed me

But that pales in comparison to the headphone output, Which has simply left my jaw on the floor and exceeded my expectations, the headphone output is easily the best I've heard of any smartphone or MP3 player I've owned, it has exceptional clarity and detail to it with or without the Beats optimizations on... Speaking of those optimizations I was actually shocked I liked them and I did find they made a very noticeable difference in the output quality, Now note... they are simply a set of equalization curves they may not work for everyone due to differences in music and headphones... but in my case they've worked well and further enhance the music and video watching experience

For the record I've tried my One X+ with three sets of headphones, a set of Shure IEMs, a pair of Klipsch Image Ones and a pair of Sennheiser HD280s, Only the HD280s gave it a bit of trouble... they still sounded good, albeit not to their full potential (For the record the HD280s are a set of cans that REALLY need something meatier than a smartphone to drive them..) My primary music listening is Rock and Metal, with a bit of electronic, pop and other things thrown in there for good measure, So far I havnt found anything that the One X+ doesnt excel at playing back

Oh and the headphone output will also go VERY loud, I dont even turn it up past halfway except with a couple very low volume songs i have...

Battery Life

And now onto the massive elephant in the room whenever folks talk about the One X+... Battery life... The best way I've found it is "Jekyll and Hyde"... Let me explain

Use the phone normally, for phone calls, text messaging, maybe reading a webpage or checking email and the battery life is superb, Even some light gaming, like a little Cut The Rope or some such and the battery is VERY good and should easily get most folks through a day, Even watching a youtube video or two, either using the Youtube app or the stock browser and desktop youtube website doesnt excessively drain the battery...

....But fire up say, Mass Effect Infiltrator and watch your battery life burn...

Which seems very "No crumb sherlock" but it was definitely surprising to me after coming from the Galaxy Nexus where the screen, not the processor, was the worst offender to my battery life, Which simply means it didnt much matter what i did on the GNex if it involved the screen, the battery was going to drain at the same rate

Truthfully in my experience, the One X+ is as good as the S3 I had, Primarily because of that aforementioned issue the S3 had with staying connected to a tower, Its actually equal to my GNex's stock battery as well, which is very impressive considering this phone is packing LTE and a Quad Core processor in its svelte package

In terms of numbers, according to GSam my average battery life is 14h 40m, The most I've run it for was 16h with almost 3 hours of screen on time, To me, this is perfectly fine considering the rest of the phone and for most folks, you should easily be able to get through the day without a problem, I am connected to Wi-Fi pretty much all day, but even using LTE didnt seem to impact the battery life all that much...

Now a note, I dont really try for battery saving either... I have my phone syncing to gmail, syncing to google now, location services on, GPS on, i have that little weather widget thingy i mentioned up above on too which uses battery.. Screen is fixed at 33% brightness.. I just use it, like i usually use it, so a mixture of a bunch of things depending on what im doing that day...

One nice thing I also noticed is unlike the GNex, when the battery hits 20% its not a panic moment, 20% on my GNex meant "Find a charger in 20 minutes or im dead, Jim", on my One X+ 20% means i still have a few hours left and theres no need to rush... Which is nice, I had to buy an extended battery for my GNex, for this? I dont really feel I need one (I might get a battery case however)

Do I wish it had a 3500mah battery? Of course, But it doesnt, and thats fine, For me its an acceptable sacrifice

Quick Comparison To Other Phones For AT&T and Why I Didnt Buy Them

Galaxy S3, I technically actually bought one of these and returned it, theoretically it has better battery life, but only a dual core phone, also it runs TouchWiz which i found naggy annoying and way too like iOS for my tastes, it has a MicroSD slot, but that just adds an extra $20 to the price tag to get a 32gb card (and if you want 64gb you're looking at an extra $60 to that price tag) , not built as well and ergonomically it was a pain in my hand and i constantly felt i was about to drop the dumb thing when i was using it, in my case the battery life was completely atrocious because it could NOT hang onto a signal and would scizophrenically bop between HSPA and LTE every 2 seconds which made doing things on it virtually impossible, I also didnt feel it was all that fast over the GNex running 4.1 (At the time however, the S3 only had 4.0 so.. I guess this isnt entirely fair) Also I feel the blue color looks like someone colored it with a Bic pen... Really my ownership of the S3 went from initial jubilation over a brand new shiny smartphone to finding problem after problem before i even got home with the darned thing...

Galaxy Note II, Bigger screen, bigger battery, cool S Pen features, but it runs TouchWiz which I consider worse than Sense and the ergonomic problems I had with the S3 are even worse because of it, its also a bit too big to fit in my pocket comfortably and I was way too worried Id end up dropping it, I tried it out in the store even and it just wasnt comfortable for me, and a bunch of the things i just rattled off about the S3 are likely true about the Note as well... So yeah

LG Nexus 4, Better processor, stock Android 4.2, better battery life (I think?) and a great price ($350 no contract) however it only has, at best, 16gb of storage and that just wasnt working for me as it was, Plus theres no LTE on it as well which is a negative when you have LTE available where you live

Summary/TL;DR

Overall the One X+ is easily my favorite smartphone on the market right now, I'm immensely happy with my purchase and I dont see another phone I'd rather have right now, it would be my number one recommendation to anyone looking at a phone on AT&T, it just has a great combination of features and in my opinion the only real big drawback is the so-so battery life, But even then I'd call the battery life "Average" and not bad, The only phone I've seen with truely spectacular battery life is the Droid Razr Maxx HD.. Which isnt available on AT&T... Personally I can live with the battery life, Im never too far from an outlet and even if i was, the phone seems to do just as good as most of the other smartphones I've owned, I've tried so hard to find little problems with it and honestly, I gave up, I'm really not having problems with it (Well except the bloody keyboard..) and just constantly finding new things to love about it...

The only reason I'd caution against it for some folks would be if they were really intending to play intense 3D games on the thing constantly, Because thats going to murder your battery stupidly fast... And people who do need VERY good battery life are best looking at a different phone as well, or considering a battery case for it...