It's a whopping 622 pages, so if players get out of line, you know you can beat them into submission with it!
New sub-classes, new magic, more monsters (the daemon section is several pages), fantastic new art, a detailed town, and an intro adventure! I'm a little kid cracking open that Holmes box for the first time and buying my first Players Handbook all over again. It's grand.
Ghul and gang have really outdone themselves. I can't recommend this enough.