It's greater density makes for a more stable, though be it slightly heavier riser. For my shooting, this translates into a better release, and a steadier bow arm. When you combine it with the rigidity that it gives to the bow itself, it is easy to see why it makes sense to use it. Some would say, [and I can see their point], that it is way less interesting visually than an exotic wood. However there are many examples of bows with micarta/phenolic wood combinations that are simply stunning. Also- like a number of exotic woods- some bowyers do not enjoy working with it because the dust can be irritating.