These are a good way to reduce your rolling weight. I ride an all mountain bike and have installed these with plenty of talc with 30-40 psi in 2.3" tires. I always carry a spare, but have not needed one as I have yet to get a flat. I'm sold!
These are incredibly light. I run them in the front tire only as they have very little puncture protection. In the rear I pair these with Ultralights. This combination seems to work well.
I've been on these things for years on my 29ers. Yeah, I know they are 26er tubes, but I have yet to have a problem. Cheap, easy way to shed a lot of rotating weight. Tubeless doesn't work for me, as I change tires a lot for conditions. Also, tubeless has not been reliable for me. I flat maybe once a year with these tubes anyway, so I'm not super motivated to go tubeless. They're as light as a rim strip and tubeless sealant anyway. My only whine about it has been that they are kinda pricy for just an innertube. Since Performance Bike discontinued their LunarLite tubes for mountain bikes, this is the only game in town.