I own a lot of ATCs, but if I could only own one, this would be it. Belay a second, assisted catch on lead, light, safe, exactly what you want. It works well in every situation, and the only reason you would want something else would be if you aren't that comfortable belaying or you know your climber will spend a lot of time hang dogging a route. Those situations call for a grigri, but everything else, 95% of climbing, this is the one that you want.
