I refuse to put anything other than PCM in my helos. I flew with PPM for several years, and had occasional glitches that caused me to loose my concentration, once I switched to PCM they all went away. I know about the argument that it masks problems, but I think of it in terms of not masking problems, but enhancing the signal. Anybody who actually understands the differences will agree that PCM is cleaner than PPM. I will never use PPM in my helo again. EVER

And in comparison to how much everything costs that is relying on the RX, the extra costs is not that much.