A product likely not made here anymore, so crazy expensive. Everyone seems to hate the enduro and trail bike riders. Truly heavy duty at 4mm, I don't expect any unwarranted failures, but it adds probably 2 lbs. to the bike. I had a failure not long ago with a much lighter inner tube. There are fewer and fewer legal places to ride to so, I end up riding mostly on State lands tight woods trails with rocks, worst seems to be on the power line accesses which have been graced with large trap rock suited best to heavy maintenance equipment.
These tubes are 4 mil and heavy as heck, but worth it for the pinch flat security they provide. As long as you have it on a larger CC bike you should not have a problem with the extra unsprung weight in the woods. I would NOT run this tube on the track however. I will also say it's a bear mounting a tire with this in there.