I have one, the cooling is ok. All it has is a fan place in the front and in the back, other than those mount points, there is no other "vents" or slots or anything, it could be better. But I have no fans, and have yet to see any problems.
It's doesn't have the best airflow out there... but it certainly won't be a problem. And it probably is notably warmer than the Super LANBoy, but it's upside is that it isn't UNGODLY FUCKING UGLY.
We reviewed one back awhile ago when (WE) (OCA) was a site, and the probs was that if you have the HD in the lower mount and a big Vid card, 5900 for example they almost touch and there is no where for the heat to rise to.
Its blocked between the two and for the most part the circulation is poor......