Well in case anyone ever googles this… i got one and it seems pretty good, at least on the turbo bike. Each sprocket is a separate piece (no carrier like with a Shimano cassette) and I was a bit puzzled when I first popped it on the freehub as it apprared to be missing a spacer until I noticed that the largest sprocket had a dish on it so you just need a very thin spacer between it at the next sprocket. I’d have noticed this had I taken it off the little plastic carrier with a bit more attention (which I didn’t as just assumed it was like a Shinano one.)
