I use the Lyman Revolution for cleaning. I have two others, both home made, that worked well but that are used for storing cleaning equipment since I got the Lyman. It would work for mounting scopes but I wouldn't want to use it for anything where I was applying any pressure to whatever I was working on. An example of this would be drifting a sight in or out of a dovetail.
I found that I want something very rigid when working on rifles or pistols. I have a clone of the Shop Fox vise mounted on one end of the bench. I made some inserts for the jaws that are wood with leather on one side. This way I have a choice between metal jaws, wood jaws, and leather jaws depending on what I need.