I've got one as well, and pretty much agree with what Kingpin said. It's a shame the side grille doesn't have a dust filter, so you may be better off investing in one or two 4-in-3 modules and fitting some decent fans to them, if you haven't already. Plus it's no good if you've got extra-long video cards, but I assume you already know the situation there.
I used the hole for cable management instead![]()