I discovered this album about five years ago on used vinyl and for a while it was my favorite album of all time, period :) It really does have that kind of power to win a listener over. It is an album-length conceptual work that is meant to be listened to as a whole. There are several very melodic segments interspersed with harder rocking sections that are still very melodic.
The concept itself is about an extraterrestrial or a spirit of some sort (it is unclear which) who befriends a blind boy. It sounds kind of hokey, but in the end it is the music that makes this work. If you like _2112_-era Rush, Hawkwind, or _Terrapin Station_-era Grateful Dead you will definitely like this one as well.
Having said that, I would advise against buying the CD release of this, at least until they come out with the original master and not this horrible remix. Others have discussed the details already in the reviews so I'll just leave it at that. It is very much worth the search to find on used vinyl.