I've been racing for almost 2 decades now.. and I can tell you that going from a "sport" speed control to a "racers" speed control with brushed motors, you will have a noticeable difference! You get more power, smoother throttle and more brakes! Not to mention most have various profiles for tuning. You can buy top of the line used brushed ESCs on the trading forums and ebay for pennies on the original price. A Novak GTX sometimes go for as little as $30! They were $175 in there day!

Jerome