There is a difference between the original MDD case and the FW800 versions.
The many holes by the fan and elsewhere are missing in the later years. Is this a production change to save money? or was this indeed a better cooling system?
1st one (early models)
http://farm4.static.flickr.com/3524/3898824755_c915896f06.jpg
2nd one later models.
http://farm3.static.flickr.com/2457/3898824447_0d74e0d007.jpg

Which is better?