I run savox and you can get either the 1257 or 1258... one is just faster and the other has a little more torque. I personally prefer the speed. I have heard they might cause brown outs with spektrum gear but I don't record which as I do not use them. The only reason for that is because the BEC voltage isn't high enough to provide for both the RX and savox servo, so you can try using a glitch buster, or getting a BEC.