While I know the cheap ones work just fine, renthal has a pretty big name in sprockets. I went with it for that reason. It Looks like it would be nicer than the cheapy ones....I had an AFAM on my yfz and it doesnt look nearly as nice as the renthal.....but it worked, and for half the cost!
Yes, the Renthal looks bullet proof. Mine looks like its made of carbon and the design of it reminds me of a Sidewinder sprocket. It wont be long before more companies will be gettin on the band wagon so the choices will be more wide spread but for now the Renthal is the one to have.