This Drobo is a workhorse. I've swapped out so many drives in this thing, stored so many files, and watched so many movies from it and it just keeps going. It's got four open bays just waiting for you to cram up to 4TB drives into each bay (16TB total).
Remember all those printers you've bought that didn't come with a cable? Who does that?! Not this guy. I'll throw in some free USB and Firewire cables.