Spektrum sucks compared to the gtb3, I bought a specktrum for my b4 buggy, I fought with to get the esc to program with the radio. Never worked, the throttle wouldn't stop no matter what I did even with the epa's down all the way, so I ran like for a bit and it was glitchy and the range wouldn't go across a 2 lane without fail.

The gtb3 it's far better and the speed is better as well.