I like the integration with the contacts and Account and Sync, as this definitely provides a somewhat more complete Facebook-experience than FriendStream. So, I might do some testing and turn FriendStream off in favor of this.
EDIT: I've done some testing, and it seems it won't sync with contacts after all. I've picked existing contacts only, as I don't want 150+ people in my contacts list, but when I press Link to Facebook in a profile, it opens the FriendStream Facebook (Facebook for HTC Sense) and asks me to log in. Aaarrrgh.
EDIT2: Aaaaaand now FriendStream tells me I have no friends. Oh wow.
EDIT3: Just did it all over from the start, and FriendStream managed to find the old links to the contacts so I didn't have to do that all over again. Set FriendStream to sync contacts only, and Facebook 1.3.0 to handle the rest. I really wish they'd introduce more widget styles like FriendStream though. I'd like a widget that fills 4x8 squares on the home screen, instead of the tiny little thing they've got now.