Nick G.wrote a review of Mammut Smart Belay Device on May 31, 2010
The only issue I have had was at the gym using an old fat top rope, really hard to lower smoothly. Other wise have been using it outdoors since December with no issues. Great for belaying a leader. I like auto lockers, but think its too easy to keep your hand on the lowering lever (mistakes do happen no matter how experienced you think you are), no moving parts keeps this from happening, just keep your break hand on the rope. For thirty bucks it a great deal, if you dont like it chuck it on e-bay or something.