They are not bad sprockets for the money...there is in fact way way better but still not bad...you can screw up almost any sprocket with super abuse but I have one on my streetfighter stunter that is huge and have yet to have a single problem ...so if your looking for economy than this is a good product ...but the rule of thumb is "don't expect the best out of the cheapest part" when buying upgrades...you have low, mid, and high price and normally the quality of product coincides with that.

 

ive had mine for about 6mnths.i dont ride too hard and i do some twisties.i clean an wax the chain about every two weeks.ive heard some horror stories but so far good at my end.i have te -1 +2 set up.