Bob, I agree that the decoders are expensive but to be able to use up all the non serial servos I had was well worth it! I have done over a dozen planes in the SBus and most all had at least one decoder in it and I haven't had any issues with Futaba (of course), JR, or Hitec, or for that matter most of the cheaper Asian servos when used on a decoder.

Birdseed, your experience parallels mine and I believe the servos are definitely the culprits here. I did a whack of testing this weekend with battery power from a 4.8V NiCd, 6V NiMh, LiFePO4 6.6V, and direct (no regulator) LiPo at 7.4V. The only one that "seemed" good was the NiMh 6V. However; when I peaked that battery to 7.2V coming off the charger, it too caused the "jitter". I was beginning to think these servos were allergic to Lithium!!!! Just kidding of course. In my installation I had a decoder in each wing and one in the tail. Oddly enough and supporting the theory that Savox was the culprit, is that NEVER did the JR DS8411's on the flaps EVER jitter at all, at any time! Also only the left aileron Savox servo never jittered. It was always the rudder and one or both elevators as well as sometimes the right aileron. Very odd stuff, but when I replaced the rudder with a Futaba servo, it was rock solid all the time...again supporting that Savox is the culprit. Now I have a few friends using the Savox brand exclusively in their 3D planes and they love them, which is partly why I chose Savox. The servos are great on a servo exerciser and plugged directly into a receiver, but on an SBus decoder they are jittery.

Thanks for sharing your experience...I thought it was just me for a long time...
Len