Good for hauling medium-wieght gear
I've had one of these for about 7 years. When you need to haul gear, its nice to have the lock-out feature, so that you can use it as a simple pulley OR a hauling pulley, so that you don't end up carrying 2 pulleys or worse, a pulley and an ascender to catch. I haven't had trouble with it catching, but I've used it mainly for hauling lots of midwieght (30-50 lbs) bags on a fixed line, or something like scuba tanks that are heavier than you'd want to manhandle. I guess the only thing I'd like is if the lockout handle was metal instead of plastic, but I'd say that about all new Petzl cam devices.