4pl uses new S-FHSS mode, but it can also use normal FHSS mode if receiver doesn't support S-FHSS. I have used 4pl abaut two months and it has been very good transmitter. My previous transmitter was 3pm 40mHz and the 4pl is much better to use (bigger screen and more buttons). I think that 4pl is great transmitter with low price. I haven't used FASST transmitters so I can't say abaut the the differences between FASST and S-FHSS.
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Xray XB4 - Serpent S411 - Tamiya F104W - Yokomo BD7
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