This is the best comparative review of vises I have seen. It give a good side by side $ for $ type review. There may be some, I don't know if they cover the Norvise, they did not consider but nothing is perfect. If money was not object I would get a Norvise. I would love to have access to a machine shop to try building my own with a old time treadle from a sewing machine.

http://www.flyfishohio.com/Vise%20Re..._Shoot-Out.htm