The MannMade, or MilCom, bridge is my all-time favorite vibrato. I think the original is a better unit than the current PRS offering for two reasons. First off, the MannMade trem is one big chunk of metal. It sounds GOOOOOD. I don't want to say it sounds bright, but to my ears, it sounds more "alive" than the later 2-piece trem. And yes I can say that because I've replaced a 2-piece trem for an original MilCom before. The most noticeable difference to me is the increased sustain. And if you pause to think about it, it just makes sense. If you slice the sustain block off a trem and screw it back on, even a circus monkey can figure out it won't be as "connected", and sustain will suffer. Now, the one area where the new PRS unit does equal the MannMade is tuning stability. I can't tell any difference at all in feel when I operate either trem. And they both return to tuned pitch equally well.
If anyone cares, my personal preference for a trem is the vintage-style MannMade trem, but with raw brass saddles. Awesome tuning stability, great sustain, musical tone, and they look beautiful. Getcha some!