Interesting from their Q&A section on the website:

"How is X-CAD able to be given away free?
Yes, we are spending inordinate amounts of money, but we think it is worth it. You get CAD that typically costs thousands of dollars and we get a relationship with you and learn how to make this the best 3D solid modeler on the market today."

If you read into that statement, it looks like the first 100,000 to sign up by August 1st will have the "honor" of being a Beta Tester for a completely new piece of software... Wow. What a deal...

No thank you! Nothing worse than doing a design, and having the dyam program crash on you.