I have owned 11 of the WD greens.
4 of them were 1TB, all are still alive and kicking after 1-2 years.
7 of them were 2TB, 6 of the 7 have failed within a year. 4 of them were new purchases, 3 of them were replacements for failures. 4th failure I just gave up and never sent it back in. They were purchased from varied retailers as well. Some retail, some OEM.
Going from memory here, but i think the EARS versions died the fastest. Wanting to say 4 of the 2TB's were EARS drives. (2 new, 2 replacements) The EARS drives showed a gradually increasing reallocated sector count before finally throwing in the towel. The others just bombed with no warning, one day they just started making a lot of noise and Windows threw error messages.
All of the PC's these were in were well set up and fan cooled, fed by reliable PSU's hooked up to a UPS and they were not all in the same PC.. some have seen totally new street addresses. Hard to pin all those failures on some common factor.
Not trying to crap on the deal, more of a heads up for buyers. Back these up if you purchase. Even if they were new and not refurbs. Having to re-rip my entire CD collection made me want to have a rage stroke.