Have to admit- didn't use for technology purpose- bought to hang outdoors lights from a pop-up shelter for a party. Worked great, even in the rain. Next morning, found they had held up the lights through a thunderstorm. I've got to imagine they'd hold computer wires equally well :)
This "hook and loop" wire tie has no hook at all. It is some sort of embossed pattern that works for 2-3 times, and then no longer clings. NOBODY seems to sell a true "hook and loop" wire tie, not even Velco. (You can only get true "hook and loop" at your favorite sewing store.) This has been going on for more than two years. BUY AT YOUR OWN RISK.