I've been cycling well over 40 years and have very rarely had a tube failure that wasn't due to my own ineptitude/carelessness in installation, or, the inevitable random puncture from road debris. I'm experienced, careful, mechanically inclined, and still make a mistake now and then installing them, and we all hit nasty debris without knowing it til we hear the PFFSSSSTT!!. These Cretons that rate tires/tubes based on how often they flat, are just that, Cretons!! They're either being careless in installation, or they're hitting debris, at least 90% of the time. Use talc and get the tube in straight, without folds or kinks, get the stem straight BEFORE inflating and these tubes are as good as any. I used to get even lighter butyl tubes from another retailer but they discontinued them, probably because every time someone got a flat with them, they blamed it on the tube. Lightweight tubes FEEL GREAT! I'd still be using 45 gram butyl tubes with my 180 gram race tires if they were available. These are now my default tubes for most riding.
Was this a gift?:
Bottom Line Yes, I would recommend this to a friend
Many people may not think saving 20 grams makes a difference but it does, OK in the order of a slightly noticeable improvement. The ride quality also improves a little as the thinner rubber is more compliant. Reducing rotating weight at the rim is the not so secret way to making your bike faster and this is a low cost way of making an improvement. The difference in puncture resistance is negligible as the penetration difference is about 0.3 mm between them. Nashbar kills everyone for price on these lite tubes and I have had no quality issues with them.