Those won't fit over my brake line flexible leads.
I have a set and try to use them when I'm on a line of some sort but they seem to be limited to ridged brake line. Nothing else seems to fit for me. Copper water lines with the fat brass flare connections will work.
So... To me they have no value.
BUT, for 20 bucks you really can't lose because they work as a box end just fine, and for 20 bucks that one in ten thousand times it is needed is worth it. (and they make great breaker bars/bad angle adjuster by hooking that open slot around another wrench)
Buy them. If nothing else, your secret Santa victim will think he hit the lotto.