Just a couple weeks ago I was setting the failsafe. I set it to full brake and didn't think much of it. As little while later I was testing servos and noticed that my throttle servo needed to be reversed because it was braking when I was giving it throttle. What I didn't know was that it also reversed the failsafe! So if it lost the connection it would just pin it! I even ran it like that once, luckily I cought it before anything bad happened...