4x, well, the thing is, I've never had a nail or bolt to pull out that the old vice grips couldn't handle. So my question is are these really worth getting and that much better? What is better if the vice grips have never failed? It does sound like you are giving them a pretty strong endorsement. Perhaps they are worth a try.
But $17 or more for a pliers is not cheap to me or that much of a deal. I'd try them for $8 or so. I like to get most of my tools used and cheap when I find them, generally of excellent old US made quality when I find them too. $2 to $3 each is about what I'd pay for my average hand tool in good shape. If I really needed something, I might buy new for $10 or less, but don't do that very often. It's all about perspective and what is value to you. Tools in general are much more expensive today than 10 or 20 or 30 years back, and I usually like those older ones much better for much less cost used than most newer ones. - Paul