It's the extra PC content that players have been looking for.
You get four races. Note that only one of these was actually included in the Elemental Evil book.
- Deep Gnome (Svirfneblin)
You also get a dozen pages of spells, 43 in total.
And it's all free! That stated, the $8 print version is also completely worth it.
[5 of 5 Stars!]