I've got a 6" pair in my house box recently I've used them a number of times on a stripped or worn nut where I wanted more of a normal pliers action that vice grips would not afford.
I'm sure something like knipex cobras might provide a bit more versatility, but these worked like a charm, when I got them positioned just right they gripped well and got the job done.
Another situation they worked really well for was when I had a bunch of boots I could not get a socket on because they were painted over from the factory.
The RG's gripped really well without much damage and I was able reinstall the fasteners with a 7/16 socket with most of the paint having been crumbled off during removal.
I put them in my box because they were kicking around the garage and I figured I'd see what happens, I expected to not use them and eventually take them out but now that they've come in handy I know they're staying put.