A combination of a vice grip and an adjustable wrench, this tool will lock on and stay there. It is comfortable in the hand and adjusts smoothly. Looks like it will stand up over time. I've bought several for different locations.
I used mine for the first time yesterday to try to remove the nuts on my mower deck of Craftsman riding mower. I used it as instructed, but wrench would spread as I put torque on it and began rounding out the nuts. I used a standard 12" Crescent and it worked just fine as it has several times before. I like the measurement gauge on the tool for telling you how open the jaws are, which kept me from giving it a lower score. The "additional grip" does not work at all. Once you look closely at the design, you'll see why. It does not provide any additional grip at all. I have not tried this tool on an already stripped bolt or nut, so perhaps it has some use there. However, I'm quite sure I'll just reach for a Vice-grip in this situation.
One of the Best tolls made by craftsman! Strong for any job in tight corners. I have respected Sears for Quality in tools that last years. My experiences with craftsman tools has lasted over 50 Years.