Always used Sabretooth 2x25A for Ironside and MMM, worked perfectly in Ironside for 5 years no problems. Cannot speak highly enough of them.

Tried all sorts of controllers for MMM when the Sabretooth went wrong (direct short across the motor outputs c/o LS3 and condensation from the gas bottle) - they all struggled to give the power, control and reaction speed needed.

Have gone back to Sabretooth - and MMM is flying again like it used to - sent the damaged ones to dimension in the states and were back within the week. The circuits now bonded better to the heatsink. If you use the sabretooth just make sure you bolt through the board and heatsink to a solid base on all 4 corners, and keep liquids off it.

Would not use anything else.

Trev