Pre convert here. One week in of ownership.
First off, the battery life for this phone absolutely rocks compared to the Pre. People who are griping about EVO battery life need to try a week with a Pre...they'll come back whimpering. Loved my Pre (wife using it now), but the battery life was harsh. Thank goodness for spares and my 2 Touchstones.
Loving the screen size, and Android isn't all bad, though I'm not terribly happy with the loss of WebOS' multi-tasking setup. Android makes due though, and the processor is mind-bendingly fast on this phone. Sense makes it almost like WebOS...close, but no cigar. There are little bells and whistles that bolster quality-of-life with the phone though compared to the Pre, such as google searches using your voice, visual voicemail, etc.
Couple of gripes:
Light leakage. I could have sworn I didn't have it when I purchased the phone, but now I can see light showing through at the bottom left edge of the screen, but only in a darkened room. Makes the phone look cheaply assembled. Watching this closely to see if it worsens, but for now, it's not worth returning the phone over.
Oh my god, the video quality on this thing is positively HORRID. It might technically be 720p, but it's actually ASSp-resolution. Yep...that's my official name for it...ASSp-resolution. Viewing videos on the phone's screen, I don't see much difference between the Pre and EVO for video quality, which is a MAJOR bummer considering the supposed power of this phone and the EVOs screen size appears to be damn near twice as large. So very disappointing.
App store. Much greater selection than in Palm's WebOS catalog, and the overall quality and scope of what's available is much better, but finding stuff is a pain. I like WebOS' tag/search function, and they do a nicer job of sub-categorizing apps in the Palm catalog. In the Android catalog, there are a few categories and the apps are just sort of "thrown in there". Makes finding the goodies much more of a chore than on WebOS. Oh...and Android apps overall seem to be more expensive. For example...Radiotime on WebOS = Free. Radiotime in the Android catalog = $3.
Overall, the phone is pretty good, and I'm not unhappy with my purchase. There are some serious limitations though, the primary of which, at least to me, is the poor video cam quality. I'd like to not have to carry a DVD palmcorder with me on vacation, but looks like I will be...this one just doesn't cut the mustard AT ALL.
If you're a Pre/Pixi user, enjoy the WebOS experience, and are thinking about jumping ship to an EVO, you might consider holding off until after the first of July when the merger is complete. HP/Palm will probably be announcing new hardware shortly thereafter. I'll be keeping an eye out for an announcement, and if it's compelling the EVO might go back if I'm still within my 30 day return window. Only been a week though and I'm still in WebOS withdrawal.
I will say that Google's hiring of Matias from Palm, who was the architect of the amazing WebOS user interface, was a masterstroke. Having used both operating systems, I can say the major area where Android is lacking is in the UI. I'm betting future iterations of Android will have his fingerprints all over it, which will be great for us end-users.