I have tried them a few years ago. Never actually had the internals fail, but the outside case is a hard brittle plastic. All other servos the outside case is flexible but the blue bird ones are a very hard plastic. If they cop a hit from anything the mounting lugs just snap off. This was about 3 years ago that i tried them, unsure if they are still made out of the same material or not. Not really game to try them again. I have had success with the tower pro servos if your chasing cheap servos. But I have also heard of other people having trouble with them so they may be a bit of a lottery. But at the price they are worth it i think.