I recall the first hard drive I ever bought: 50 MB. Yes, that is MEGA bytes - thus about 0.0013% of the 4 TB drive being reviewed here. That 50 MB drive was several times larger, much slower, and cost $500 in the 1980s.
With that information stored in my biocomputer, it is difficult not to be favorably impressed by a speedy, multi-terabyte drive that costs less than $200 unless it failed to work properly.
I am using this drive both as a time machine backup and for storage of a few other items, and have never had a single glitch from it. I particularly like the fact that it derives its power from the USB link, thus reducing cable clutter. Many years ago I read a comment that a technology does not truly transform society until it becomes invisible to the user, and modern storage technology is coming fairly close.
Of course, the true test of a hard drive only comes with time, and I might have to update this rating if it suffers a premature failure at some point in the future, but until and unless that time arrives, I can definitely recommend the Seagate Backup Plus (STDS4000400), at least on the Mac platform. Having had TWO drives from a competing "reputable" manufacturer fail before they had been in use for two years, I am a bit cautious about an unqualified recommendation. This one has been in use for only a few months at the time of this review.