"very nice, but not for thick ropes" - Review of Black Diamond ATC Guide

This is a nice device, although I have to agree with caleb that it's really ideal for ropes below 10.5 mm (great for twins or doubles). With beefier or stiffer ropes, it's really hard to dole out lot of rope quickly to a leader as he/she tries to clip gear for instance. For skinny ropes, it's great. For belaying directly off gear in guide mode it works very nicely as well. I tied a short loop of cord through the small hole and that way I can easily clip a 'biner and sling to it to give me the extra leverage to unlock the device to lower the second.
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