The Pedestal vises are weighted, but you may still experience some movement when tying different patterns. The most important option in a vise is its hook holding capabilities. You want a vise that will hold your hook in place, even when extreme pressure is being applied. A hook that slips and slides in your hook jaws will create frustrating moments at the tying table. Most vises that you find today are built very well and should last you for a life-time of fly tying.
Many manufactures even add a life-time warranty one there vises.
This is always something to consider when making a major purchase. The Hair Stacker was probably one of the best tools invented for the hobby of fly tying. It greatly improved the look of flies and speeds up a tyers operation considerably. There are several different models to chose from in hair stackers. There are standard, adjustable, and large models.