I switched from a BB to a Hero, and for the most part I'm very pleased with the change. I'm not big on Gmail (I've used a yahoo account for years), so Google integration isn't just huge for me. I do prefer two things about BB over the android OS, and those are the push email and facebook app. The BB email works absolutely flawlessly, and I've yet to see a third party app that can compare. In most cases, any third party app that claims to push email often will not work correctly. One such app even took part of a text message that I had received and put it in to an email that I had sent earlier and sent it as a text to the person I was texting. And I've yet to see a Facebook app that compares to the BB, which pushes notifications and wall posts, also. And their app shows actual status updates all at once instead of the news feed, which I can hardly stand. I don't care who did what in Mafia Wars. All told, if it can be pushed, BB pushes it.
With all of that said, though, I love everything else better about the android OS.