I've used the original Spektrum stuff since it was first released in a Futaba 3VC and noticed no difference in reponse time to the original 40MHz set-up, no voltage issues in 1/8th (2 high power servos ...... often ran for an hour plus at practice sessions ... never a hint of trouble), have run anologue and digitial servos (I am odd and have gone back to analogue as I find them more reliable than digital!!!!) and no problems again.
I think the basic Spektrum stuff is really good ..... can only assume that the pro stuff is going to be even better! When my basic Spektrum kit gives up (hopefully a long time down the line) I will buy Pro but for now I am happy, can't recomend it highly enough.
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