The Wilton machinists vises are about the best-the vise bar is round, with a straight pull nut, and a keyway machined into the bottom of the bar, that eliminates side to side play on the movable jaw. Lifetime lubed and sealed, to keep crud out of the works, and a meaty anvil. Still made in USA, but, I don't know how long that will last.
Best,
Ted
I just took a look at them on line and see that only three of their lines is still made here, all round bar. Nice piece of work though, I'll have to keep my eye out for one at the local sales.
The Yost is a standard vise, made in Holland, MI and the price was right.
Found this thread while googling vises, these guys are into it!
I'll show you mine if you..... 
