Never heard about it and their description sounds a lot like propaganda. Also couldn't find a link to try, purchase or otherwise obtain any product from them, except a contact us link, where I'm supposed to contact them and talk about my company's needs in a compiler.
Also couldn't find a description of what exactly from C++0x is supported?
If you don't mind experimenting with an alpha implementation of a standard that is not yet a standard, maybe you can try ConceptGCC. The tutorial and documentation is quite intriguing, and they are pretty clear on the experimental nature of the project.