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I used to race with a M8 & Spektrum module which was excellent but now I run a 4PK and my racing has improved tenfold. IMO how it feels is key but a slightly quicker radio helps.
That's because an M8 with Spektrum is SLOW. I didn't notice any difference in feel when I went to it a few years back but my race performance dropped off dramatically. I went from coming close to a few A mains at major races to struggling in the E overnight. I thought I was just missing the car set-up but after a year of terrible racing I put the FM stuff back in and was instantly competitive again.