 You really can feel the difference. We knew from flying the F-100 that the J.R. 8411 servos were great, but because they were installed for the first flights, we had no comparison. 
The BVM F-4 has been around for several years and has flown with various combinations of servos on the stabilator. Just recently we installed two of these
155oz digital units on the Phantom's stab and took it out for a test hop.
The pitch control was noticeably smoother - a real "locked-in" feeling, even with the C.G. moved aft a bit from the position shown on the plans. (We now use 12-3/4" verses the 12-1/4" originally shown on the plans.) It seems that the bigger the control surface is, and the faster the model goes, the more influence these powerful digitals have. The tech people at J.R. do emphasize that when these servos are "ganged" together you must spend some time making sure that they are in harmony (not fighting each other) throughout the entire range of control travel. Correct linkage geometry and freely pivoting hinge systems will be rewarded with precision control and long term reliable operation. In case you didn't see the latest J.R. advert on a whole new range of smaller digital servos - check it out. BVM uses these in some of our RAM 500 size jets.
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