It's been almost ten years that I've been using a (few) WD MyBookLive (MBL) as my home server. In the end I used it for pure NAS tasks (Samba) only. The original 3TB became too small a couple of months ago, and I started looking for a larger harddisk.
At that time the price for an 8TB NAS drive would be about 220€. Hence my surprise when I found an offer of a new WD NAS called My Cloud Home with an 8TB (WD RED CMR drive) for just 199€. Even if I would only use the disk it would still be cheaper - I guess that's the benefit of WD, being a harddrive manufacturer...