I was eyeing them up for several years. Finally bought one, the green one, when I made a new workbench. Wasn't sure I'd like it either. I fell in love right away. I use it for all sorts of gun work, making bows, lots of stuff. I have 5 vises in the shop now and they all get used depending on the application, but this patternmakers vise gets used more than all the others combined. I shouldn't have waited.
One more thing.... it mounts to the bench with a threaded rod and big wing nut, and my bench has dog holes, so I can move it anywhere I want, or remove it if it's in the way, literally in 10 seconds.