Well I haven't been on this forum for ages but thought I would put my 2 cents in. I have 2 APBT's,my male is nearly 2 years and my female is 18 months. Before these dogs I owned GSD's and before that a couple of cross breeds. This is just my opinion but these are my observation's/experience's.
-My favorite breed I have owned/met
-Most affectionate dog's I have owned/met
-As smart or smarter than any dog I have owned/met
-Worst guard dog's I have owned
-Most Energetic dog I have owned
-Most personality I have owned/met
-Most dog aggressive dog's I have owned.(would never take to dog park,and if you think socialization is going to correct this i would think again)
-Would never leave the two together unsupervised
-Fantastic around kids/strangers (like any breed should always be supervised)
-Never left unsupervised to roam yard (if they want to get out,they will get out)
-Like I said, my opinion but not suitable for everyone!!! If you think you can get a nice puppy and leave it in your backyard all day and pay it hardly any attention with your 6 foot colour bond fencing i would think again.