Another vote for the Spektrum Pro Series here. I have used it in my 17-year old Futaba FF3 for about a year, and just this weekend in my new 3VCS. No problems experienced so far, it just works!
The Pro Series has no perceptible change in response in either system, and I notice no difference between this and the old 40Mhz system. The new 3VCS is better than my FF3 for response.
I can thoroughly recommend the Spektrum Pro Series, and the diddy receiver is superb. HTH
