I have used the balljoint press that they offer @ AZ. It was PERFECT. Basically, you BUY the tool ($99.99) and when you return it, you get your money back. Simple as that. It's their FREE loaner tool program.
The other day I was @ Harborfreight, and they had THE EXACT SAME TOOL there for about $40.00. If you plan on doing more than 4 sets of ball joint swaps in the next few years, BUY that one. It will save the hastle out of messing with the BUY & Return program they offer @ AZ.
Ryan