good coparison Crashmaster today i went night flying and di 3 4s battery slow thought so far so good to flip tomorrow i want to change to futaba radio just make sure it not the radio and fly with 4s battery.I would like to point out that the x650 V4 is a world apart from the x650 Pro and although they look similar they are two different machines.
Here it is lays out differences quite simply:- http://xaircraftamerica.com/blogs/news/8406539-difference-between-x650-v4-and-pro