OK, here's what I like about this book--the exact same rule-lite system as BASH! Fantasy edition, none of those weird soak roll rules from the supers version. For $15.00, which I still argue is steep for a pdf, you get a highly workable system complete with the standards--aliens, psionics, starships, mecha, etc with solid rules for a good number of genres and random alien species generation, so it's as if you're buying 3 or 4 books of the price in terms of usability of the content. My one complaint, as far as content, is that a "giant transformable sentient robot species" section was not included, though those types of characters could be worked up with the system with a little time. An adventure generator would be nice too, but that's probably pushing it.
As for the documents themselves, I appreciate the print-friendly pdf, but why include pictures in it? The table of contents and index are not hyperlinked, which is a little annoying.
These issues don't bother me so much, but be aware that the book is mostly illustrated with stock art you've probably seen before and that other than named sample alien species emulating sci-fi staples, no setting information is given.
In short if you like the BASH! Fantasy rules set and want the same quality of hidden gems were genre is concerned, you'll love this.
[4 of 5 Stars!]