As someone who rather stupidly built a home media server using WD Green drives (both drives in the mirrored pair failed on the same day... Doh), these things will be fantastic. Currently I'm running on the last gen of the Seagate NAS drives, and have had no problems. OS on an SSD and a few of these for storage works a treat.
They are fast enough for media data store type tasks, and now big enough too at 6TB. The ones I have are nice and quiet too, which is important in the home. The ineteresting thing is the NAS optimization, basically it just makes the spinning rust more reliable for 24/7 running. I did read an article on it when they came out, but can't remember the specifics.
A few of these may well be on the Chrimbo list.