Looks interesting. The only problem with your unique CD is that it doesn't change with your hearing profile. And if you are having an off day when you create it, then you have something that is permanently not quite right.
Looking at the info, it seems that it is basically customised masking. Your hearing profile, where you see the dips on a chart, is 'filled in' by sound that is assumed to be your tinnitus frequency - as long as your tinnitus actually does match any hearing loss that you have. The interesting part is in the sounds that he uses, I'd love to hear them and analyse the content.
The price of the CD's is a bit steep, I know there is an amount of work that has to go into them but £37.90 for 3 CD's is not a 'special offer' at all.
Did he say what he would be charging for the machine?