I've got about 9 of the 3tb WD Essentials (not the Elements drive) and they work great (knock wood) - I have taken most of them apart to use in other cases, they've got the WD30EZRX inside, which is their top-performing greendrive, with 64 mb cache. They were cheaper in the external cases than to buy the raw drive. Problem might be warranty since I have taken them apart, but at $45/TB I can't complain too much.