Another problem is that you can only fit so much battery on a 1/10 scale car/truck. I suppose that you could go as high a 6S if you were using a 1P pack, but at that point the pack is starting to get pretty heavy.

Running the 4600 on 4S lipo is a beast. Arguably the fastest setup that you can get in a MM system. I like the lineup that they have. I suppose that my opinion would change if there esc could handle more cells.