I have never played either NiGHTS game prior to downloading this album, and I had actually not been exposed to its music aside from a cameo tune in Sonic Adventure.
That said, once I started listening to the album, I was extremely glad I downloaded it. I haven't even properly listened to all of the tunes on the album, yet I know they're all of good quality. Now, if I get the chance, I want to try the original NiGHTS, to see what I've missed.
In short, fantastic job to all involved