Had an Android (1.6) for a year. After the initial excitement wore out (a week), I could barely answer a phone call since the interface bugged out everytime. The battery wouldn't last for a work day, and every app froze/crashed randomly (including contacts, phone app, and other system apps). The only good experience was MotoBlur syncing perfectly all my profiles, yet it's interface was just as crappy.

I already had a MBP and an iPod/iPad so wanted to balance things out and experiment with development. It was a terrible idea - I'm infinitely happy with my iPhone 4 now.