RE: spectrum servo
I picked up two at the LHS. Same mounting pattern as the JR3021 or JR Sport MN48. I had set up a new plane for the MN48's, bought a couple of these new ones for aileron / elevator duties.
At 6.0 V regulated, they were jumpy when moving - jumping back and forth up to 10 degrees or so while moving. Once stopped, they didn't dance around, but they were sure unstable when moving.
I took them back to the LHS. They tried them at 4.8V, no problems. Tried them on a 2 cell LiFe battery (~6.6V) and they jumped around when moving. I traded them toward the ESC and stuff I needed to finish my E-Flite Pogo.
I'd sure like to hear others' experience with them. I would love to be able to buy a nice fast digital servo for 20 bucks, but I've been running 6V batteries for a few years now, and am not looking to switch back.