I think that review is slightly out of date as far as the game goes, there may have originally been a playable demo, but I don't believe there is anymore. Equally though, I think you could only originally buy the game on Cd, so it's not all bad.
If you are considdering buying the game, I'd say the review does a pretty good job of showing it off, though imho monkey business is the most complicated 3D audio game yet, sinse it doesn't have half of the navigation or customization features of something like Shades of doom or sarah, and the terane is very complex.
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)