The short review:
DO NOT BUY THIS DRIVE
I, like most people, bought this drive to use as a back-up device.
All was well for all of 3 months and then the dreaded hard drive click of death at the exact moment I needed to perform a restore...
DO NOT BUY THIS DRIVE!
I did a quick Google to see if there was a simple fix and discovered to my horror that this is drive is notorious for failing after only a few months. So I wasn't unlucky: the drive is just really poor quality.
DO NOT BUY THIS DRIVE!
And to add insult to injury, the default RAID setting means that if just one of the two drives fails then you irrecoverably lose all your data (I'm excluding the £1700 cost if you take it to a professional data recovery firm as uneconomic for most users. If your data is worth that cost then do yourself a favour:)
DO NOT BUY THIS DRIVE