My trusty mx-3 is finally starting to die, and I've been looking at the newer mx-3's to replace it. It looks like I can pick up used mx-3fhss radios on ebay for about the same price as a new flysky (I'd rather go with a used airtronics than a new flysky). Anyway, how does the mx-3fhss compare to the newer mx-sport or or mx-3x?