Its a cool little gimmicky device that's looks probably outperform its function.....

I'd take a disc lock over that any day of the week, its smaller with less moving parts and your unable to sink a bolt cutter on it or any other kind of tool fast and in a hurry. If that doesn't put your mind at ease run a kryptonite chain through the rim/swingarm. Either way its only gonna be a theft deterrent not theft prevention, still would only take a couple guys to pick it up and toss it in the back of a truck or van and peel off