The works great and the best place to buy them, if you are buying more than one, is uncle-lees.com
We use them for .45s, .22s, and 9mm. Great for a quick clean after a day at the range (my favorite use) or as part of a normal cleaning regine. I don't think the completely replace a good bore brush for a hard core clean job, but in terms of time and what they do, I won't be without them again!