I'm having trouble finding any reviews of the rock claws that RRS sells for their tripods. I have had problems with the feet of my tripod slipping, especially on slick rocks and wet, hard-packed snow.
Anyone here using these things? How much do they help, and do they complicate carrying the tripod in a backpack that has a base pocket for the feet (or will it cut through the material of an F-Stop tripod bag?!). Also, would you recommend getting three of them, or would one on the front leg be enough?