Ive been flying a wide selection of all of the Spektrum servos in anything from Hotliners to a 10' EDF flying wing (hiflight cover model!).
For the price they are amazing servos and i compare their centering abilities to be just as good as JR. I wouldnt have any second thoughts about using them in a jet. Matter of fact, i replaced an 8411 with one after the 8411 quit working.