I've been using my Bit Char-G that I recently bought, and I had to go out to my local Toys R Us and by a Microsizer motor for it since I can't buy things online. The Microsizers I've seen have a "turbo" button that gives the car 2 speeds. Is it really that great? Does it make a big difference? Or should I just stick with my Bit Char-G controller and car?