If you like Jazz-Fusion, this is a great album - really great. If I were allowed just six albums to put on my music player, this would be one of them.
Some of the other reviews have covered this in greater detail, so I won't repeat it, but I do believe this album has more mass-market appeal than you might think. There's a lot of instrumental jazzy sections, but they're catchy - they're good to listen to. No pointless noodling ala King Crimson or Pink Floyd. Solid stuff.
A++++++ would listen to again - and frequently do.