As a fan i am massively impressed with the directors cut of Iron Sky, it's like a whole new movie. The directors cut features 20 extra minutes of previously deleted scenes some of which alter the style of the original film, and that's not all, they've added a boatload of new visual effects throughout and made the Meteor Blitzkrieg even more awesome than before, they've even replaced some of the musical scores with new ones. What they basically have done is taken a "crazy B movie" and turned it into a "crazy B+ with an extra side of crazy movie", it's just like the back of the movie case reads: "It's an all-new take on the film".

I must suggest however (and this is just my personal opinion) that this directors cut only be watched by people that have already seen and love the original theatrical cut of the film, why is this? Because, the film really has been considerably changed by the inclusion of these deleted scenes and the new musical scores. Some of the new scenes work great in the film while some others are ether unnecessary or do harm to the flow of the scenes they were fit back into, even though i love this directors cut i have a strong respect to the way the theatrical cut was edited, the flow of the film was so much more balanced. A great example of another film with a theatrical and directors cut with similar levels of changes between the two is "Donnie Darko", If you've seen both versions of that movie then you know what i mean. The directors cut of Donnie Darko complements the theatrical cut, it just shouldn't be watched first, same thing goes for Iron Sky.

So if you're already a fan of Iron Sky then buy the directors cut, however, if you've never seen this movie before then i suggest buying or renting the theatrical cut and see what you think first. It's unfortunate that they didn't just include the theatrical cut in this release.