I love this brushed speed controller from Hobbywing. I think this is my favorite upgrade ESC. It is highly versatile, programmable and settings can be modified using the included controller card. If you need to set different parameters for your RC crawler that the stock ESC could not give, this upgrade is highly recommended. I like it so much I bought 2 - will definitely buy again if time to upgrade other stock ESCs. Great price for great quality and performance!