I switched from a Futaba 4pv to a Spektrum DX5R a few months back and I've had no issues nor do I regret it. If anything I got faster with it. I know plenty of guys with dx4c radios that are very fast with them. One of them if I remember correctly podiumed at the one turf nationals up in Connecticut with one. To say spektrum is a downgrade is a stretch imo. I also use Savox servos without a glitchbuster and don't have issues