The Hobbywing Skywalker 120 Amp V2 motor speed control is economically priced and ideally suited for medium to larger sized builds. It's rated for a 3-8S Lipo, 120 amps constant and up to 150 amps burst (10s). Outstanding features include Active Freewheeling for better throttle response, cooler running at partial loads and better efficiency. The BEC has an adjustable voltage range (5V, 6V, 7.8V or 8.4V) the constant current output is 10 amps with a 30 amp peak. The ESC has many parameters, which may be programmed with your throttle stick or with the  HobbyWing ESC Programming card.