Look, 4th Ed is not my favorite system. Both 3.5 and 5e were better at a number of things, in my opinion. That said, this book is very cleanly laid out, and is quite successful at its objective of getting you to understand 4e swiftly. So, if that's what you're after, it's a fine choice. The art is quality, and even if you're not a fan of the rules, both 4e and 5e introduce a large amount of interesting fantasy art. Also, it doesn't hurt that it's made available for free.