I've been using Michelin tubes for more than thirty years and find them to be reliable. I've never had one fail at the valve stem, where the cheaper tubes tend to fail.
Mounting on the bike ring would seem loose but installing on the tire fits perfectly
Thick tube good durability..
I've been using these tubes for years and have had only one defective tube. This is a much better record than I've had with house-branded tubes such as Performance. These aren't the lightest tubes out there, but the rubber thickness appears uniform, the seams are well made, and the valves work great. Sorry that the previous reviewer had problems with these, but my friends and I have all had good results with these.