Coming directly from android its quite a difference (first iphone).
The build quality is quite remarkable, this is be most quality feeling phone I've ever had.
The sync thing still confuses the hell out of me as I never know if i choose to sync if its going to wipe my phone. So basically I just do everything manually which i feel is probably limiting the usefulness of my phone as I also cannot then utilize wireless sync.
I desperately miss the "back" button. I've come to rely on it much more than i had anticipated. I'm already a bit annoyed at having to start over at the home screen all the time.
It's so fast... like wow... fast. The presentation of everything is pretty impressive, though that is an iOS thing i suppose. The reception is much better than my D-Inc.
Glad you like the phone. If you are frustrated feeling you have to "start over," you may not know that you can double-click the home button to access your apps in order of recent usage (also drag that back and forth to access other apps and settings).