I looked at them about 2 years ago. They are definitely cool looking. It is an excellent concept that we know works (4.6L modular Ford, etc) I would be really curious to see how well they hold up over time. Ray brought up some good points. There are easier ways to make the power, but I am not saying it doesn't work. I would love to use a set, that is why I looked into them.
Someone in my position needs to either talk a customer into forking over the cash to try them with no guarantees, or spring for them myself and try to make it work. Not many guys want to take a 10-15K gamble when there is something else that we know works. There is lies the problem. It is very similar to building a 750+ ci engine. You could just as easily build a 598 ci with a Whipple and have a turn key piece with off the shelf parts, not something that has a bunch of one off, custom made parts. Again, I would love to do both the heads and the 750+ ci engine.....I just need someone willing to try it. Pretty much every customer wants a guarantee that there engine is going to run. That is why they are having a custom build engine in the first place. If they dump 10-15K for some heads and intake and it doesn't work, then who is going to pay to fix it? It's a tough call. I would still love to do it though. Hope this shed some light on it from an engine builders point of view. If anyone wants to builod an engine with them, by all means, let me know. I would love to be involved. I'm all about some cool new chit to play with.