Paul
check out this web site.
http://www.spiralturbobaffles.com/
I just returned from DVSF V. This guy had a demo set up. He also donated a set of these pipes for the auction. I won the auction. It will take me a few weeks to make everything fit etc. So, I don't know how they sound yet. However, a couple of guys I talked to had them and liked them.
Paul