I'll have to take a look at the MT-4. It's been a long time since I bought a radio so I'm a bit behind on what's new. If the 4PKSR is noticeably faster than the 4PL then it's safe to assume it's faster than my M11. But i'm curious if I'll even notice the difference between that and the M11 because I don't notice any lag or delay during racing other than some glitching I sometimes get which I did not think was possible on 2.4GHz.