The MT-4 is plenty fast, its a big step up from a spectrum radio. I have seen a few spectrum users walk off the stand because better radios over power them. You never see that with an airtronics radio.

The radio will work with any ESC, no compatibility issues there.
There have been issues with Savox TG servos and lower end spectrum radios paired with weak Bec's.
The 7a bec in this ESC should be able to handle any servo you throw at it paired with the HV capable airtronics reciever.