yes the Mini-x is fairly slow with the stock four cell battery ( good for beginners though) but I promise ya, with the 6 cell pack the speed more than doubles, I have a hard time running in anything less than a 20x35 carpeted room. I upgraded my Mini-X with the Novak Spy ESC for better speed and to get brakes, and it makes a HUGE difference in the driving experience. My mini-x can keep up with my 1/10 scale TC3 car in smaller areas because of the awesome acceleration and handling in the corners. I installed a deans plug on my 6cell battery and use a MRC Super Brain 959 charger and the setup works fantastic. I cant tell you how much greater the 6cell setup is, it will leave the Mini-Z in the dust and probably would keep up with a micro RS4. Get that 6cell!! you wont be sorry.. After you run it with 6cells, youll swear off any other cars.