I have a set of these. They do work well, as the original post says, but I tend to use them more for holding flats or removing 8-sided plastic nuts and such.

I have a set of these. They do work well, as the original post says, but I tend to use them more for holding flats or removing 8-sided plastic nuts and such. One downside is they gunk up pretty quick if you're working with messy stuff. My 40 year old car has so much grit and grime underneath it (that I'm afraid to spray for fear of knocking something loose) that nearly every job is a dirty one. The teeth for the adjustable part are very fine unlike a typical channel lock, so they get packed with grime and hard to set sometimes until I clean them. I had the same problem with another push-button fine adjustable channel lock with a similar mechanism. The old C shaped channel with 5 positions never has this problem.