The one from Raidentech is certainly the 10 speed version you have heard referred to. I started a thread on this very subject some time ago. It is generally believed that all S&S are also with the variable 10 speed motor control similar to a esc. If you buy from Raidentech, put the coupon code in to save 10% - I think its panther . I saw recently they were sold out of the Tiger so better to call them first and confirm this.