I have done a fair amount of searching on this and other forums regarding the use of these sprockets. There are not a whole lot of responders who have actually used the product. However the responses have been nearly 100% positive. I think they are worth a try and I have some on order. It may take me a few weeks to get them, install them, and evaluate them but I will give my feedback too. I have no friends or bias involved with any performance enhancing upgrades.