Sometimes when things are inexpensive, they are a good deal. Other times they are just cheap. The latter is my experience with these. I threw them in on an order on a whim, thinking why not. How bad can they be. I tried one and it never made it out of the garage. I changed the tire in the AM, went down for my lunch ride to find it flat. Figuring it may have been a pinhole or a loose valve I added a can of Vittoria tire sealant. That didn't work either because before all the sealant got into the tube, the whole mess blew up. I decided instead of trying another new tube, I'd grab one of the patched up tubes I keep around for times like this. Several hundred New England winter miles later, the multipatched tube is still holding air, and three new cutters are sitting on the work bench.