Awesome servo, highly recommended for small to medium foamies. I've used these as an upgrade from stock in situations where i've hopped up a park flyer (bigger motor/prop etc.) I've never had a failure or problem running these, excellent product couldn't be happier. Only complaint is sometimes availability is an issue. If they're in stock, don't wait, buy them! They go on back order fast.

I ordered two of these servos expecting them to be as well made as the five gram servos I previously ordered. One of the servos had a defective potentiometer which failed to limit the servo motor travel when it was made to swing from one end of its arc to the other. I sent it back to have it replace under warranty and the replacement servo had the same defect. Sending that one back wasn't worth the cost so I took the servo apart to see if I could figure out what was wrong with the potentiometer. As it turns out, the defect in the potentiometer is a small one and can easily be fixed. Inside the potentiometer there is a half disc formed from concentric copper rings and when it is viewed edge on there is a u-bend on its circumference. This u-bend is normally supposed to contact either the positive or negative power lead terminals in the potentiometer and in my case, the u-bend was not large enough to completely contact the negative terminal. I was able to fix it by using two jewelers screwdrivers to enlarge the u-bend so it completely contacted the terminal. As I said earlier, the servo now works perfectly; however, I'm only going to used it in an expendable plane.
The five gram servos I ordered have worked extremely well and I was very impressed by their quality. But considering the fact that HS-55 servos aren't much more expensive than these 8 gram servos, I have to say that they would be a better buy.