Got my g2 yesterday, and coming from the gnex, this is quite an experience.
1. First thing I noticed, DAT SCREEN. This display is truly awesome. I was hesitant coming from my gnex that this ips panel would look washed or not vivid enough as the gnex amoled is so saturated. Well I can happily report that this screen is vivid, colors pop, and the black levels are pretty close (close enough for me) to the amoled screens. It gets very very bright, and importantly to me, DIM! I hated reading my Kindle app in bed with my gnex even with the black screen and white text being too bright. Finally, the damn screen covers most of the phone and it makes the phone very attractive. My wife who has been an unwavering iPhone user since the 3gs actually said she was jealous of the g2's aesthetics.
2. Second thing I have noticed, DAT PROCESSOR. This thing hasn't stuttered or lagged once since I've been using it (which isn't very long). Very satisfied with the speed.
3. Battery. Am still really figuring out what this will be like. I'm an "ultra user". I do emails, calls, ordering parts, snapping pics and texts all day. My gnex would be dead @ 12pm after taking it off the charger @ 6 am. I've been off charger since 7am and battery is @ 79% and it now 9:20am. Jury is still out, but I think this battery is better so far. I bet I could get much more time if I could limit my screen on time...
4. Camera. Hmm this one I'm a little bit confused about. I cannot get this thing to take a clear shot if there is ANY movement whatsoever. I took a stunning clear shot of a shoe (weird I know) but it was up close and perfectly still. Kids don't stay still. I still have to experiment, and we should all help each other in this regard. (I'll post my shoe shot later)
5. Call quality. I have only made one phone call and I have to say I was impressed and disappointed. Weird right? The actual caller sounded better than the gnex, but as I was driving home I kept noticing this "digital screeching" sound. The phone call was a one hour call, and it didn't do it constantly but if it was a business call it would annoy me to the point of being distracted. Am going to try making a call at home while stationary to see if this affects anything.
6. Bonuses. Knock on. Holy crap. Best feature ever. Seriously awesome I barely use the back buttons. I've heard of people having issues with it, but mine works every time. Wife thought this was a huge plus and so do I. Higher output to my headphones/fm transmitter. This thing cranks the line volume out in spades baby. I love that.
7. Issues. That camera issue I spoke about, but have a feeling that's more on me and not the phone. The call issue is annoying but I can't really call it yet due to the small sample size of call time. A weird brightness change when scrolling through websites. It's been spoken of on the forums and I definitely notice it on my unit at lower brightness settings. Auto brightness is off, but the issue persists. It does not bother me much at all.
8. UI. Coming from stock, I am bummed at the bloat ware, and have this sinking feeling that this crap is draining my battery prematurely. Otherwise it's just fine and as I get to know it more the experience will improve as it is pretty good already.
9. Conclusion. I am in love. Even if I can't tidy up the call quality and camera issues I'm still keeping it. It's that nice. I am optimistic about correcting them, and am enjoying this device very much so far. I haven't gone into any apps functionality yet so my apologies for not going into the software.
Thanks for taking the time to read my initial impressions!