I guess with the big heavy steel case, vibration from the hard drives is not much of an issue?
On a related note:
tomshardware.com recently reviewed a bunch of cases, including ThermalTake's Shark case. The reason I'm looking at TT Armor is that TT's webpage claims no EATX support in the Shark, whereas Tom lists EATX support in almost every case he reviews. Is the Shark motherboard tray optional? (My guess is that it is the tray that's not EATX friendly...)