bearbreeder wrote:

First of all, the guy you emailed was not "Petzl," but rather likely some sales rep who could very well know less about climbing than many of the senior members of this forum. If the guy is actually a solid climber, he knows that statement was bullshit but he had to say it for liability reasons. Second, the GriGri is one of the most commonly used devices in slacklining. We use it to serve as a mechanical brake to stop the pulley system from despooling. When using the GriGri as a brake in long slacklines, the force subjected to the GriGri is far greater than what is normally seen in the climbing world, and the device is always operated "hands free" with nothing holding the rope. To date I have never heard of a GriGri randomly slipping without being overloaded. My GriGri has likely had over 100 hours of "hands free" time on it holding my slackline. I normally tension my longline in excess of 2,000 lbf which means the GriGri has to hold in excess of 400 lbf. at times.