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Ihave one, it works great, not noisey. I check the chain for tension, when I'm in there changing the oil. Put about 20,000 kms on it, no problems.
It's nice not having to adjust or worry about a loose chain.
I installed one as part of the winter mods. I have riden very little because of our winter weather so I can't give it an honest review. I can tell you it does not whine like some have said and I don't have the "clunk" when I put it in gear. For me it was a "myswell".....as long as I was in there, myswell put it in. BTW, $72 sounds like a great price.