I'd be real careful buying the Smoke Mechanicals. There are a lot of " bootleg copies" going around right now. The originator hasnt even produced them since early 2009. The ones on Ebay, and other sites are copies, and not the same quality.
On a side note, I just picked up some of their Ramcats, and they look to be a good head. super sharp, and supposedly one of the best flying fixed heads you can buy.