The Gamestop pre-orders came with the "Monkey see, monkey boom" pack which I actually enjoyed quite a bit. The missions included were as fun as anything else in the campaign and Hurk was a funny character. Worth getting, IMO.
Worth it? No, not really. But I get my Microsoft Points for free through Bing, so I bought it.
I enjoyed it, but it should have been 400 points. Then I would say it's worth it. --- http://i.imgur.com/VKZH3.jpg http://i.imgur.com/tMlSo.jpg http://i.imgur.com/OXGN0.gif http://gifsoup.com/view5/3907877/otw-o.gif