Badass II if you want the original or Hipshot Kickass. But you have a lot of options really: Hipshot A, B, Kickass; Babicz; Fender HiMass, and I've probably left a few out. There's also the titanium version of the stock bridge with threaded saddles which does every bit as much for sustain as high mass. Have fun shopping!
Yes I have one on my PJ and it works great. I've also used and loved the Badass II*. The Kickass has adjustable brass inserts on the saddles which makes setting the string spacing a breeze. On the Badass you have to notch the saddles yourself (easy to do with the right files and once it's done you never have to think about it again). It's important to remember that when you switch to a high mass bridge, some adjustments may be necessary. The baseplate is thicker than the stock bridge and sometimes the saddles bottom out before the action is low enough. This means putting a small shim in the neck pocket to raise the neck. It's easy enough to do and only takes a minute or two, but many get frustrated when they think it's supposed to a no-brainer drop in replacement. *If I had my choice today, I would get an original Badass II over a Kickass. Even though I'd have to notch the saddles myself, I like the fact that it's made in USA (Kickass is made Taiwan and let me be clear, that's not a bad thing), and I like the infamous BADASS stamp.