+1 on the cost. Definitely a significant increase over coneheads of the same size/weight.

I haven't played around with them enough to know, but it seems like the design of the head will really limit options for collars and finishing the fly. The slots in the metal seem like they will make it difficult to add a few turns of something like marabou or schlappen, and/or dubbing. Even if it works, the look will still be fairly linear.

Danny, taking fly fishing lessons? They must be playing hockey in hell.