Your hobby shops are wack! There's nothing wrong with the 7950's at all! In-fact it is one of the toughest servos I have ever used. No problems what so ever!

There were a couple issues with the 7940's at first, but those have been taken care of as far as I know. I have had no trouble with my 7940's either.

The way I see it is that any servo will burn up if you treat it wrong. Maybe your hobby shops' customers have been treating them wrong?