Between myself and 3 others at the tracks we run, there has been issues with the stock motor mount letting the motor move. It usually happens on tracks with big jumps. I stripped a few spurs and have seen others do the same. With the Grid mount it has been a "set it and forget it" type of thing. It also makes gearing changes a 2 minute drill....It takes me longer to decide which gear to run than installing it and setting the mesh.