George S. picked the brushes up at FTU, and asked me try them for tying the MGM. They come 4 per package, so cost-wise they are about $2 each.
I was able to tie 2 flies with one brush. The fibers were much bushier than the brushes I've been making with craft fur. They hold the shape much better. I don't yet know how that will translate to action in the water. They only new modification I made with these was to put red in the general gill area, per George's request.
I was able to shave almost a minute off of my tying time, bringing the time to only a little more than 5 minutes. The issue was picking the fibers out at every second wrap. If you don't they trap underneath. This is still not a show-stopper.