Ben fired the band a couple/few years back. Google for back story... He's been using PRS since almost the beginning of BB, and if I remember correctly, a platinum Standard 24 model? Then when they switched to Drop Bb, for Phobia, is when he aquired the PRS baritone(s).
Pete also should have a sig model, too! He tweeted some time ago that he was working with PRS on one. Wonder What's Next? ... I tried to be witty there and probably failed, it sounded better in my head. Haha