MT4, no issues with various servos or other problems that seem to be common with Spektrums. Although recievers don't have bec they do supply the power to the bec so it is a pelative question. This is where Airtronics works so well, virtually no compatibility issues. Recievers are $50 for the cheap ones but once you have a car programmed in the radio you can switch recievers to other vehicles without making any changes. I wouldn't do that often (might damage a wire or plug).