Potentially, yes, but as I said, I have put them in many, many aircraft with thousands of total flights and never had a problem. There is also the issue that the servos on those surfaces tend to use the most power and putting them through a Matchbox means another set of connectors and associated voltage drops, but again, that's not a major issue.

Using old servos (I don't) even if you don't trust them is totally different than using a new, known component for its intended use. To compare that, or using a "known faulty component," to using a Matchbox or in a jet is ludicrous. The giant scale guys have been using Matchboxes for multiple servos on ailerons, elevators, and rudders *forever* in harsher environments than our jets and they have a good reputation. I would not hesitate to use them - if you can get them adjusted correctly.

Bob