Pay no attention to the review that claims this scan is missing a book. While that might have been true at one time, I recieved everything that was in the original box set when I downloaded the file. Both the Lorebook of the Void and the Concordance of Arcane Space are included, but only the Lorebook of the Void is bookmarked so you have to scan through the other book manually. Let me say again: BOTH BOOKS ARE INCLUDED WITH THIS SCAN.
As for the material, it is top notch. Spelljammer is certainly not for everyone, or every player for that matter, but it is an interesting campaign world. I don't think it should be used simply as a mechanic for getting from Krynn to Toril, however, because doing so sells the whole concept of adventuring in space short (and you don't want the whole thing to end up feeling like the movie Krull). In essence, Spelljammer should be similar to a seafaring campaign set upon a fantastic ocean of unexplored and mysterious wonder. Not a setting for everyone, but definately recommended for those with the imagination to pull it off. And for a low price you're getting over 200 pages of material so you're bound to find something worthwhile in it even if you decide against running a Spelljammer campaign.