I've been using Stanley pliers and Irwin vise-grips for the last 15 years or so, both of which have been good, but I can't find the high end Stanleys, and the Irwins are one of the sets I linked to. My current set is small (size), small (few), old and rusty.
I think that a lot of people who use Kleins use them almost exclusively on soft copper and braided steel wire, and less hardened steel, tubing, etc, Klein being best known in the electrical trade (although even when I was apprentice electrician, I switched to Greenlee almost immediately). I have to cut through spring-style hose clamps fairly often, and that chews soft cutters up in a hurry.