The good: Lots of interesting variations on goblins without having to memorize 12 new stat blocks. Very much a good way to spice up a common monster without havign to re-invent the wheel. Or in this case, the wheel with lots of teeth that eventually explodes.

The less good: Some of the restrictions are a little hacky (for instance, there's an exploding goblin that can only be ignited by a particular other version of goblin, which given that the explosive is mundane, seems a strange restriction). One or two of the goblin kin seem like they've got enough difference to warrant a XP recalculation, but don't get one; I haven't done the crunch on this to verify, so I could be wrong on that point.

Special mention: The artwork is outstanding and justifies the price of the download as much as the content.

Overall: This is a great bit of inspirational work. Nothing too mind blowing, but lots of solid "Huh... that's pretty cool". Influences are transparent, if not outright stated, but feels like a solid supplement rather than geekfluff.

If you would like your goblins to be a little less predictable and need ideas, give this a shot. It's worth it.