I've got an old Kalt Baron heli that i've had and flown for the last 25 years, it was owned by Billy Pierce (Kalt Rep if you remember how long ago that was) and used as a demo bird at events, it's got THOUSANDS of flights on it and still using the same little stardard JR servos from its original build never even a gear set. i'd venture to say a Jet will NEVER see the kind of abuse (it's a very smooth bird but a great deal more vibration then a jet) that these servos have seen and they have never missed a beat, if it ain't broke........don't fix it.