I am running the 4300kv pro4 hd now and love the power. Was running the 4600 pro4 but it seemed to run a little warm and under powered for the weight. So I went to the tenshock 4000kv and 4600kv they ran cooler and more power but we're not very smooth. Now the 4300kv feels perfect as far as power and smoothness and also cool. But it is power hungry if you go with the 4300kv get some high mah lipos like 6500 or above IMO.