Very little 'real' information, use of 'CD quality' as a buzz word...sounds like crap to me for FM.
For AM it might be compelling (look at an AM reciever wrong and you get interference), but FM typically sounds poor due to compression and limiting more than being a poor way to give you a signal (XM and Sirius also can't do better than good FM). If you wish to test that, see if you've got any FM stations around that play classical--they'll typically have it done somewhat well.
I could be wrong, but I have a feeling that if it were really good, there would be no trouble finding actual facts about how it well it works, along with absolute and perceived quality (beyond advertising), like you can find for Sirius and XM's offerings. One way they could make it sound better, too, is to not have the digital stream compressed and limited in such excess as the standard FM one.