Cartridge inflation is useful when you need save space, weight, and time. I keep a fresh tube and inflator system ready to go on my road bike that has scarce room for a pump. Otherwise, this is a commodity product that does what it's supposed to do.
you can't underestimate the value of a CO2 cartridge in your seatbag. you can spend 5 minutes with a frame pump working up a sweat while your group ride waits for you, or you can use one of these. well worth the pennies
Compressed CO2 is Compressed CO2. Not much performance gain by spending more money on name brand cartridges. I have never had a problem with these cartridges and they are a great value. Spend the money you save on better tires or tubes
I have not found these cheaper anywhere else, not even close. So they don't have a sticker on the outside making the cartridge flashy, who cares? It's gonna stay in your repair kit until you're sitting on a dirty sidewalk or on the side of some dusty trail with your tire in your lap. They're a steal! One cartridge fills one tire, nice and simple.