It should be noted that if you're coming from an iPhone, you will not have access to an application that synchronizes your music, videos and contacts with your phone.

If you use methods to check/pay your bill via the phone, # or * followed by numbers, you're going to lack that feature as well.

But as far as the IM goes, you're well covered and none of that badly implemented stuff like on the iPhone. True multi-tasking, truly implemented into the OS... and done well.

Music, I'd say that if you're from the school of doing it yourself - I personally like to drag/drop my files as need be - then you're going to be happy there.