My LBS had a great explanation ,I really liked the geometry of the RM, liked the tunable assist, I also was looking at a Bosh in a Trek 7, That said, his explanation if you have a RM dealer for support awesome choice if you travel a lot to ride, theres a lot more support for Bosh motors throughout the US, verses the RM, motor which is greatly limited at this time, I choose the Trek for that reason, I'm very impressed with it performance, I also would of felt the same with RM, I liked local LBS support and if I'm on the road, having support throughout USA having a Bosh motor