When you need this capability, they work
When you have something you can't afford to mar, nor break, and yet grip in order to perform work, these jaws might be your answer. Recommended to me by a gunsmith, he was encouraging me to learn how to do my own barrel change. I was working on an AR platform, with the relatively thin, aluminum receiver, and needed to grip it sufficiently to remove the barrel nut. And of course, replace the barrel nut for the new barrel. I applied ~ 60 ft-lb torque when all was said and done (32 ft-lb to start, and the rest, to get the next groove to line up for the gas tube). Yes, the jaws are "fiddly", and like many such things, if you can't handle that, you should likely be taking your firearm to someone else.
Good tools, need stronger magnets
Have used these to mount a couple scopes to some barreled actions and the jaws work great, however wish the magnets were stronger. Have had them fall out while trying to get the barreled action in the vise and while trying to hold the action in one hand and run the vise handle with the other its super annoying when the magnets dont hold the jaws in place and fall on the floor while your hands are full/busy. I may try to find some better magnets to replace them at some point.
Pleased
I am not a gunsmith. I will use these for working with small parts. I've tried these out with a few small pieces to see how they hold for cleaning or polishing. Therefore, for my limited application/s, I believe these soft jaws will serve me well. I have three other designs that I use in my garage for larger items ( that are not a delicate as gun parts ) that work very well. From my experience with those vise jaws, I am confident my perspective on these Wagner jaws is that they will work well for me.