[Touch Diamond2, Pure Q&A, Help & Troubleshooting] gkai:
Happy with my D2 after 2 months of usage. I have not changed Rom or radio yet, I'll probably wait for official 6.5 upgrade before playing with hardspl and custom rom, but overall, the stock device is very nice. Battery life is what I expected (not great, but I have 2 days of moderate usage or 1 day of heavy usage ... it is ok. And it seems to get better with radio upgrade, and an extended battery in the 1300 mAh range may become available while keeping the same size...)

Screen is amazing, the resolution is so high that everything is very very crisp and ebook reading is almost as nice as e-ink. Only difference is that it is a transmissive technology, not reflective, so nice in shadow or in your bed, not nice in direct sunlight. touch sensitivity is ok, not as good as capacitive but not by much...and you have the stylus for old-style interface...and for handwriting recognition...and old keyboard...and making drawings. Best of both worlds, in the end i prefer this to a capacitive screen...

And the D2 size is perfect for me: not too big i never feel it is more anoying than a normal dumb phone...But still big enough to have a usable screen where WVGA is not overkill (it is not, but just barely: people which can not focus on nearby objects should beware that WVGA will be a disadvantage).

Whatever the technical evolutions in the future HTC models, or competing smartphones, I think the D2 has hit the perfect size: I would not change it at all, keep the overall size of the D3 or whatever exactly the same (but make its screen 3.4 inches maybe ;-) )

So to summarize, the screen, overall size and style of the phone makes it a winner for me, there is currently no other smartphone I would have instead. I expect this will change in 2010, but for me the D2 is the best choice in 2009...As a bonus, I have found the GPS very sensitive (even indoor) and accurate. It is a battery draw and it lags (not too much, but sometimes annoying), but it is more sensitive than my previous bluetooth GPS-only device!

Now for the drawbacks:

-lowlight performance of camera. It is not only the absence of flash, the camera is not sensitive enough, or the auto-iso is not correctly programmed. Low-end nokia phone are much much better at nightshots, and iphone 3GS is better too. They have less pixel, but imho a highly sensitive sensor with less pixels is better for a phone, for high def pictures I have a dedicated camera, the phone is there for the unplanned shots, and lowlight performance is much more important for those kinds of shots than megapixels...I hope this can be corrected by OS upgrade, the lens opening seems no worse than the iphone and better than the nokia...but maybe 5 megapixels CMOS sensor are inherently less sensitive than 2MP or 3MP ones...

- poor wifi sensitivity, D2 have much more trouble than a laptop with weak wifi signals...and more trouble than other handheld device. I hope radio upgrade may improve things a little, but I al not too optimistic, it may be a poor antenna...

- some slowdown of TF3D sometimes, or of the phone in general, and poor playback of movies...but here I am almost certain that playing with custom roms and using something else than windowsplayer should improve things a lot.

With xda-developers, I expect to keep enjoying the D2 for at least 3 years before getting tired of tuning my phone and buying the latest and greatest as replacement.