The carbon kit is well built, solid, and crazy weightless -- it's like air. Though the strap looks pretty strong, I wouldn't trust it, and really don't need to. I just slip the thing in my pocket and it's completely forgotten that it's there. I've not yet had the opportunity to use, but have read the instructions and practiced with it on my practice tire (just so I've some experience with it when the real-world moment comes). Works perfectly for me. It's so light, you might get the impression it will break or crack. But, it works as described. Again, my suggestion, if you get the kit (and you should get it), would be to waste a tip and practice. And, get some spares.