[Nokia Lumia 900] emjlr3:
Got the phone two days ago, have been using it a bit since then, here are some general pros/cons, with a more detailed write up following some more use. Hopefully this can help some people make a decision on whether to purchase or keep the phone themselves. I will not comment on the software (most newer WP7 phones work just about the same here), aside from the Nokia specific apps/stuff.

Anyway, I have read probably two dozen Lumia 900 reviews, and everyone seems to have their own opinion (with some general themes shared amongst them), so here is mine:

Pros

Build quality is fantastic, best phone I have ever held. Feels amazing and snug in your hand. I am a fan of the square look, as opposed to the rounded edges of most devices. I actually prefer the Flash to the Focus S in that respect.

Built in speaker is loud, much louder than my Focus S, which is nice, but maybe a little "tin-ey"

Call quality is amazing, and signal strength is better than my Focus S (plus the 4G in MD really flys)

Screen looks fantastic (indoors). Blacks are inky black, colors pop, whites are less blue than the Focus S, and it seems to be brighter too. I don't understand how someone could choose an SLCD over this display. Sit them side by side (the Titan II in my case), and the colors just look pathetic.

With that said, looking at text is fine. Don't let PPI pundits fool you, you cannot tell a difference between say the Nexus and the 900 (partially because the Nexus uses the dreadful pentile). You really do not need HD resolutions on a 4" display, unless you plan on holding it inches from your face, which is just silly (@ a distance of ~10in, your eye can no longer tell the difference between HD and non-HD on a 4.3in screen, and its only about 7in on an iPhone sized screen). And don't even mention the iPhone, comparatively its like looking at a postage stamp, no thanks!

Auto adjust screen intensity actually works well

Nokia apps are great, especially Drive and ESPN

Color is sexy. An identical theme choice would have been sweet.

Chrome finish on the surrounding lens area is nice

Battery life, holy cow, is great. I am on day two of mild use and am still at 50% battery.

Capacitive buttons have a slightly different feedback to them than I am used to, I like it. They are also slightly more difficult to trigger, which is actually a good thing.

Slightly newer OS version

Nokia specific theme is much better than the default blue

Some Nokia specific sounds, which are generally improvements to the default ones

VVM! The phone has you set it up on first boot, so I assume(hope) it works!

Price, hell yea, I made $80 on this phone!!!

Cons

Bevel around the screen (I hate it, hurts my ear, my biggest gripe)

Speaker can be too loud at low volume settings

Can't seem to get my gmail to sync (very weird, I will need to get this fixed ASAP). All other syncing has worked just fine.

Location and size of lens and chrome is odd, your fingers are always on them when holding the device. Could gunk up that area quickly.

Weird sim card slot (its not terrible, its just strange, not in a good way). Silly Sim card remover (basically a souped up paper clip)

Non-removable battery, though I would gladly give this up for the build quality and design

Its a bit heavy and large. Not extremely so, just more so than expected. I think the device footprint could have been smaller, and I am not sure why it weighs what it does to be honest.

Screen scrolling does not feel quite as responsive as some other models. What I mean by this is scrolling seems to be slower, and you can't really throw it in one direction and have it scroll rapidly through a list quite as fast as I was used to.

Off white capacitive buttons, that do not brighten up like some other models

Pre-installed Tango needs to be replaced do allow for non-WiFi calling

Outdoor screen performance not as awesome as I expected. Don't get me wrong, its better than the Focus S, its just not all I thought it would be. I expected near indifferent performance indoors vs. out, with the hype the display received, but that is not the case.

I am not a fan of the button placement. It will take some getting used to. I have large hands, so the power button where it is is really a strain on my thumb to reach.

I can't really comment on the camera, because I have not used it much. Though what I have heard is the screen itself does not do the images justice. So do not judge their quality until you get them off the device, onto a computer or printed out. Hopefully a software update can address any deficiencies here.

Even though the specs are similar, I consider this a significant upgrade from my Focus S, both in quality, design, and features.

Hopefully this is useful information. And hopefully some more details should be incoming. Feel free to ask any questions you may have.