I just recently switched to a Moment, and I gotta say...I love the Android OS. Even being stuck with Cupcake for awhile, it's solid, firm, and stable, but still open to do what you want with it. I def miss the sleekness of WebOS and its "deck of cards" system (nothing will be as simple or intuitive IMHO), but switching to a more stable and solid phone, OS and hardware, is such a nice change.
-I hated the "oreo effect". The Slider was too finicky for me; hardware was a major downside.
-There were a LOT of bugs still in the system that needed to be worked out. I would have to re-add my email account info on a biweekly basis just GET my emails.
-My Palm Profile would hardly ever backup my contacts, apps, or anything (thanks god for Gmail backup. lol)
-The browser, while quick, left a lot to be desired.
-The App store was a ridiculous joke. I only ever used homebrew and patches (which shouldn't have been needed in the first place)
I will say though...I do miss the themeing you could do through the homebrew community. I'm a poor newlywed who was a recent victim of "job cutbacks", so I can't afford the themeing here on Android (yet!). Other than that, I have no complaints with this OS or the hardware. The Moment is a solid, fast, reliable device, which, in my world, is very much so needed. lol
BRING ON ECLAIR!!! ha ha