I've got the Eris and like it. Me, I seem to prefer the "soft" keyboard but the slide version is nice (saw one at Wal-Mart). The Eris does fit nicely into the pocket (right now I don't have a case for it yet).
DH has the Droid. He's had it about a month or two and still loves it. The one thing I don't like about it is the keyboard. It's too flat. Even with my small fingers, I have a hard time feeling where the keys are.
The other thing I didn't like about it was the price. We paid full price and it was $400! eeeeeeek!