I used a Thompson for about 20 years, wore out a couple sets of jaws. They hold very well down to 18's or so. The vise disappeared several years back along with some other neat stuff, and 7 years ago when I got back intotying after a few year's absence, I built my own vise from memory, a near exact copy of my old Thompson A...I have two sets of jaws that I hardened to a point harder than Thompson's and I like it even better than the Thompson. I have given the rotaries some thought, But now I'm old and set in my ways, and I'm stickin' with what I got. I would reccomend a Thompson to anyone.
..............................................Modo cDan