I have tried it, and there are good points, but more bad ones.

Pros: You do get the fletch to pass through a little easier. It really only made a difference with "soft" fletch like AAE Plastifletch and Duravanes. You might gain 1-2 fps.

Cons: You are no longer guaranteed even fletch contact, it depends on which bristles you cut and how many. It is much easier for the arrow to be bumped into, or drawn into one of the gaps instead of having to stay in the middle hole. I saw no improvement in accuracy. I saw no difference in vane wear when using Blazers, Vanetecs, AAE Speedflytes, Bohning, etc.