Having a tying position of the type that Stu describes is best for comfort at the tying bench. This is why I never use a pedestal base when tying at home. A clamp base allows you to adjust the vise up or down to also help get the vise to the most comfortable position.
Office chairs make great tying chairs: they are easy to adjust, have comfortable seats, and are easy on the back for hours.
If you position the vise as Stu does, you will be able to tie for hours (5,6,9+) in a day without back, shoulder, or arm pain. A.K. Best talks about using the same vise height in his book "Production Fly Tying". Virtually all folks who are or who have been commercial tyers have discovered to value of this vise height.