I have 2 APBTs - Smokey and Pork Chop (they are in my sig or you can see more pics here: http://photos.yahoo.com/obbsuperstar )

They are TOTAL sweeties!!! But it's super important that they be properly socialized as pups.
Pork Chop was not socialized as a pup and now that he's over a year old he barely ever gets to go out where other dogs will be because he's unpredictable around other dogs.
Smokey, on the other hand, has been socialized since he was 8 weeks old and I can take him pretty much anywhere with me and he's good. Of course, he's still just a wee little guy so this could change as he gets older... but as long as he keeps familar w/ other dogs and people, there shouldn't be a problem.

by the way, I have never had any other dog besides a pit. and i love them!!!