I like the idea of the tool, and the tool seems to be very well built. The idea is to carry one tool that fits a variety of sizes. (Metric/SAE) However, my first thought was that the wrench would slip when putting any torque on a bolt, due to the rotating head design. I must say I was surprised when I turned the wrench for the first time on a rusted bolt on the old 1954 Ford Panel truck. It did not slip and loosened the bolt with ease.
Since the tool is designed to fit metric and SAE nuts and bolts, it fits loose on SAE fasteners, so if you have a rusted or slightly worn nut, it won’t grab it like it should. This is the compromise with this tool, and many others that claim to fit metric and SAE fasteners.
The other issue I have with this tool, is the size of the head. It does not allow you easy access to nuts and bolts if they are buried, or have something close by to get in the way. I ran into this when taking the back doors off of the truck. I had to grab another regular wrench to finish the job.
So as with anything in life, it’s a compromise. If you have newer nuts and bolts, out in the open this wrench may be worth it. But if you are working on something old and rusted, get a good set of dedicated sized wrenches.