Mattwrote a review of Black Diamond Ice Screwup on March 4, 2016
Familiarity: I've used it several times
It mostly works as described to keep the screw points contained, but there isn't much to keep the screws in place. Once in the roll-up and secured the shorter screws can slide out. That's not likely to happen in a pack, but a more secure strap would be helpful. I'm going to keep using it, but I wouldn't buy it again.