I'm thinking of installing a bottom bracket mounted Stinger on my Giant Reign 2 (06). I've corresponded with e-13 about the DRS and I don't feel like grinding a $130 chain guide to make it fit. I ride aggressive trail in rocky terrain, but don't drop my chain often. Does anyone know if there will be fit issues with the Stinger? Is the roller plastic? Does the thing work? I know you guys will come through for me!