exactly, the "X" version is the high voltage version that you want to get. it will last much longer than the stock motor setup, especially with a 3030 prop. 3030 is a better choice for beginners, as it will give plenty of tail authority through learning basic ff, and your gws DD motor will last longer than it would with a larger prop. a larger prop like a 4030 gives better performance for intermediate pilots at the expense of heat (more heat=less motor life). a 3020 (or 3"x2" ) prop is ok for a brushless dd, but it doesn't have enough bite for the gws motor. 3030 is as low as you need to go to make the motor last.