Well i ordered a Thudbuster ST 27.2 for my BionX equipped road bike and tried it out today on a short 15 mile trip to a local bike store. the roads here are in pretty bad shape and having a rigid bike with 7ooc tires at 90psi offers no give. Very nice, it took away the sharp jabs to the back and i consider it to be an excellent upgrade. I also ordered Thudbuster 31.6 LT for the fat bike. That one only got a short test around the block and off a few curbs, seems quite nice as well. Fully expecting it to be an improvement on the off road excursions. Once I retire at the end of June of this year it will get tested in a variety of terrains.