I tried out APB for a few hours.  Honestly, I was kind of bored.  Perhaps I'm just not in the mood to play GTA right now, or perhaps this is the classic case of finding it difficult to really get interested in an MMO (because let's face it, there's not an MMO in existence that is fun at level 1).  Not sure.  I guess I'll keep going back to it until my five hours are up.