Malan's Waterfall in Waterfall Canyon, Ogden, UT 9-3-11
These things are crazy expensive for what they are, but are super useful to have! I keep them on my harness when canyoneeing just in case the rope doesn't touch the ground and I have to climb back up. If the rope gets stuck on the pull I can easily go back up without hauling heavy ascenders with me everywhere, to help get a grip on the rope when pulling it, and for use in pothole escape with some aiders! They are super lightweight and work well!