Agreed, the F.A.G. product is both low-cost and evidently low-quality. I would also prefer Shimano, from my experience, but correct sizing is an issue. The clearance on the M6R I have needing the replacement is barely 2mm from the side of the chain to the rear frame hinge, making the 118mm a little too close, and the clearance at the rear dropout tab measures even less to the chain. Shimano offers 118mm and 122.5mm, so both are really not quite right for this application, generally-suitable as Shimano has otherwise been. That said, I got hold of a 122.5 Shimano and . . . it works fine.