Barrel tapered is an advertising gimik, or as I see it. I found through the years, that if you knife edge the boo, it pretty much barrel tappers itself. When I flatten my boo, i always check it with calipers. When it is knife edged, it comes out barrel tapered. That is if it is cut to size first. With that said, I dont know why anyone would flatten boo with out it shaped first any way.

As for Rudderbows, I dont know what I think about them. They still sell bowgrip 100. Bowgrip 100 is the worse heat cured epoxy I have ever used. It fails all the time. ive made several glass bows with it, and it is the crappiest stuff i ever worked with. Why they keep pushing it is beyond me.