[One (M7) General] r.andom:
My first impressions are really good so far, best built Android device I've had, solid performance. Has good potential to become my daily driver.

Form Factor/Build Quality: Only Android device I've used that feels in the same league with the iPhone. Heavy, metal, solid. The one I'm using has a couple oddities in the plastic to aluminum casting/bonding but they are minor, I don't know that an average user would notice.

Hand Feel: In recent history I was a Note II user (prior to that S2, S1), then my Note died, swore that was the best phone ever. Moved to an iPhone and HTC One X; Realized that operating a phone with one hand is nice. The edges are rounded enough that it doesn't cut or feel uncomfortable. Device is compact enough that I can do 50%+ of functions with one hand.

UI Speed: It is fast. No noticeable UI lag yet. Even though I normally would load another launcher immediately, I'm going to stick to Sense for the time being and so far it has delivered.

UI Usefulness: If you have used other launchers it will take a bit of getting used to Sense but so far I haven't been tempted to load an alternative launcher, which is a positive sign.

Buttons: As with the One X, I don't like the power button location or feel. Too squishy and easy to hit. If there is going to be a button on the top of the phone, it should provide a satisfactory click, better yet, make it so that if a slide my finger across the capacitive buttons, it turns on the phone. As someone else commented, the HTC logo could go away, to be replaced by a menu button. I use NewsRob as my news reader and the volume buttons to toggle between articles, at first I didn't mind the texturing on the button but now it has moved to "meh". We will see if I acclimate or get sick of it.

Speakers: Spectacular for a phone. More manufacturers should start shifting the speakers to the front of their devices (why has it taken so long??)

Screen: Really nice, as with the HTC One X, bright, no issues that I can see. The HTC One X was my favorite phone display so far prior to seeing this one, now this phone is the winner.

LED Indicator: Recessed as with the One X, I wish it stuck out further so you could see it from more of an angle. Not quite as bad as the One X but not great.

USB Connector Location: Par for the course on the bottom, same as most of the phones I've had in recent memory other than the One X. Fits in my car holder plugged in without issue.

IR Remote Control: A bit gimmicky but I can see using it. The app is pretty basic but was easy to configure to my home theater.

Battery Life: Better than my One X (I can kill it in a few hours of hard use), not as good as my Note II (all day performance++). I would call it average. I'm someone who would gladly trade a few mm of case thickness for an all day battery.

Voice performance: Not enough experience to comment yet:

Wifi Performance: Solid so far. Speedtest.net on a 20Mbps cable modem is getting 18+Mbps. I haven't tested to a device local on my network yet.

LTE/Cell Performance: Used it for several hours so far without issue. I haven't seen any issues that others have reported about inconsistent wireless performance.

Camera: I like Zoe mode. Need to play with it some more and do some real tests, so far it seems reasonable but I haven't been blown away.

HTC Transfer Tool: They have a tool to help you transfer messages/etc. between your old phone and new phone. I REALLY wish it inventoried apps and loaded them on my new phone from the play store (or at least facilitated loading them), even if it didn't restore settings. As with all phones I'm serious about using, the first activity is to restore/setup all my apps, which takes far too long.

Internal Storage: I don't like that it doesn't have an SD card slot but to make up for it, the 64GB is completely usable, all on one partition. IMO that makes up for the lack of SD card. Only a few of my apps have not loaded.

My next step is to encrypt the device and see if that impacts performance to any degree.