Pros? Cool design, relocated shifter linkage (not thru the frame), GP shifting, VERY sturdy construction. These rearsets have seen two accidents now, and only bent the footpeg. The plates didn't tweak or bend. Also, Promach rearsets were used on the Factory R7 in 1999
Cons? Replacement parts are nearly impossible to come by. They're fairly rare. That's about all I can think of!