Besides a few minor aesthetic annoyances (the exclamation point in the author's name, the tips being in a somewhat random order and the cover design almost made me not pick it up) this is an excellent and thorough introduction to the UL world.
The order of the tips makes a little more sense once you finish and see that the pre-trip stuff is at the beginning, on the trail stuff is in the middle, and specific situations (bears, snow) happens at the end. However, it would have been nice to see, for instance, all the water tips grouped together for easy reference.
I've been experimenting with UL on my own, but it was nice to be able to pick up a lot of new information all at once. I took a lot of notes in my journal, and am excited to try out some of the stuff in here and have an even more comfortable and light trail experience. The amount of tips that are useful (or will be useful) far outweighed the ones that I skipped over because it's something I already do.
All in all, this is a must-read if you're going to try ultralight backpacking!