Good idea but doesn't cut it for me...
- Familiarity: I've used it several times
I like the idea of 'anti panic' quite a lot as it is surprisingly easy to do the wrong thing when stuff suddenly goes awry. However, this device really hasn't been fun for me. It is very sensitive to rope drag when lowering and the 'panic' kicks in too early with some ropes if there's even a little drag or a lightweight climber.
In short, It's just not versatile enough for me to use.