I owned a set of these about ten years ago. If you have lots of room to swing the wrench they work great, but it takes a good 15-20deg of swing for the rounded lobes to engage the flats of the fastener.
That said they were practically useless in any kind of tight situation which in automotive terms is practically everything.
I sold my set and went back to standard sockets.
It would be lighter to carry with you but they do need more range of motion so they may cause more of a headache.
Probably made in a sweat shop overseas.
I owned a set of these about ten years ago. If you have lots of room to swing the wrench they work great, but it takes a good 15-20deg of swing for the rounded lobes to engage the flats of the fastener.
That said they were practically useless in any kind of tight situation which in automotive terms is practically everything.
I sold my set and went back to standard sockets.
I have subsequently found that several other good manufacturers (Snap-On, Hazet, probably Craftsman) also make "flank-drive" sockets and spanners, but without the dual metric/imperial sloppy fit. I'm happy with my Metrinch, but if I were buying again, I would go for a plain metric set from a good manufacturer.