My SG came with a great Duesenberg tremola, but the stock Nashville bridge. I wanted something with rollers or graphite. After considering a few cheaper options; Wilkinson Roller, Stewmac Roller, graphtech, of which I knew that they weren't perfect, I took the plunge on this one. And WOW. It is amazing. The rollers actually roll, the workmanship is amazing, built to super tight standards and very exacting tolerances.. great. The saddles are tough (but smooth) to move, as there is no wiggle room. No buzzing, nothing. Very impressive stuff! Drop in replacement, not even a height adjustment needed.