Bests & Worsts Reviews from Amazon

I purchased this drive largely based upon a specific need for a USB 3.0 product with 4TB of storage. I've owned many WD internal and external HD products over time and have not had any drive failures to date over many years. I purchased this drive specifically as a backup storage drive attached to a Synology 1813+ NAS unit. This required a reformat to EXT4 as the drive comes natively formated in NTFS. The Synology NAS schedules backup to this drive of selected folder shares using the "Time Backup" software available from Synology. I'm not utilizing any of the software included from WD with this drive (backup, cloud, etc.) as the Synology NAS has its own software for each of these purposes. The drive itself is similar in size to other My Book drives. The plastic casing is certainly not as nice as the aluminum finish on the WD My Book drives that I have for my Macs, but it is similar to the black of the Synology unit and overall looks good. The power adapter is reasonably sized (not a brick), and the unit comes with a USB 3.0 cord for use with its single USB 3.0/2.0 port. WD provides a 2-year warranty with this product. There are cheaper drives with similar specs available from other companies. However, having had drive failures with Seagate over the years, I'm unwilling to take chances with other options. It's important to backup your valued files, and WD drives have played a major role in my backup solutions over time. If I have issues with this drive, I'll update my review. This seems to be another winner from WD! Edit/Addendum: Following my review, another Amazon user asked me an excellent question, "Does the USB connection to the drive feel flimsy?" This is a very appropriate question given concerns raised with the prior generation of this same My Book device. While I don't own the previous My Book version in question, I did check the USB connector on my device. The supplied USB 3.0 cable seems to be stable in its connection to the rear port of the My Book case. I can't physically make it move horizontally or vertically with any significance - unless I were to apply excessive force. Modest attempts at movement of the USB cable did not disrupt the connection. I don't plan to move this My Book from one place to another (it's connected to my NAS), so I suppose that I won't be able to comment well on wear-and-tear issues with respect to the USB connector. Other My Book devices that I own are the Mac Firewire/USB 2.0 version. Those have never struck me as flimsy. Update 1/18/14: Since writing my original review, I've purchased a 2nd unit which I reformatted for Mac OS X and use for "time machine" backup. Both drives are functioning well and have had no issues. I'm still very pleased with the quality and function of the drives. Reading through a number of the questions regarding this drive, it's clear that the term "cloud backup" as assigned by WD to this drive is a bit of a marketing stretch. As has been noted by others, the "cloud backup" option is not intrinsic to the drive, but an add-on service provided by Dropbox and facilitated by WD software that a user may choose to run on an attached computer (I don't personally use or recommend that others use WD software). These drives are nothing more than a WD drive, in an enclosure, with a single USB 3.0 connection. If you are looking for "cloud" capability, other product options do exist. I do hope that WD changes its description of drives such as this in future marketing.