Just a word of caution about Duratrax element (castle) esc... I just picked up a couple thinking this is a potential way to go. They can be adjusted using the castle link ect... and for all intents and purposes they are castle esc. The BIG problem that I see and have tested is that you CANNOT use the 1.30 firmware (at least the two that I had, did not have the option, only 1.33 and 1.38beta). As a result even with mixing the throttle channel and aux, you get some cogging issues that are no good when it comes to side-by-side racing. Of course this is when running dual esc with a single 2s lipo battery.