Review Item: 
Can do everything
no moving parts so it is really safe and durable
A little stiff
and it can lock on you easily

I got this device because I wasn't in love with the grigri. It seemed like it did everything, and it does. Anything you need to do on the mountain, this device can do, and do pretty well. It belays smooth, and auto locks on the fall. It keeps people belaying with the correct motion, where some people have a tendency to get lazy with the grigri. The only issue is that if you are working a route, the locking can be a little difficult to undo, and it can lock if the person is climbing fast and you take rope too quickly. Then it is tough to unlock... If you can only have one device and you need to belay, rappel, and you want locking, this will do it all. If you can afford a grigri and another 40 bucks for a regular guide level ATC, then that is the way to go.