To catch up a bit, folks are asking about Kurt clone vises. I bought a 6" import with swivel from Enco (remember Enco?) a couple years ago for about $100 as I remember. It's a heavy beast. The vise has been exactly what you would want. Trams basically perfectly, within the resolution of a 0.001" dial indicator in all axes.
Jaws are removable, with all the options that a Kurt has, as far as I know, never owning a Kurt. The swivel base has not degraded accuracy, and occasionally really helps out. I'm satisfied.