I have the stew-mac luthiers vice. one nice additional thing it has over the patternmakers vice is the urethane pads on the wood jaws. they grip extremely well with minimal tightening of the jaws, and will not mar the workpiece. I don't think there is a better vice for building bows. it is, however, not very good for whacking on splits with a draw knife.
the real gem is the shop stand that stew-mac sells. mine is bolted to the middle of my concrete shop floor, so I can approach the workpiece from all directions quite comfortably. for drawknife work on splits, I rigged up my Stave Press to slide into the shop stand that is bolted to the floor. the top portion of the shop stand(to which my luthiers vise is permanently mounted) simply lifts out of the portion bolted to the floor, stave press(mounted on a 3' piece of 2" black pipe) slides in. voila. in about 20 seconds I can change vises, and both are height adjustable. this set up is the most sturdy and stable I've ever used for rough work, and I tend to beat on staves pretty hard sometimes with a drawknife. having used this vise for several years now, you couldn't pay me to go back to the wood vise I started out with.