I've anecdotally experienced very high failure rates on them too, had 3/6 fail in about 5 years. And many other anecdotal reports indicate similarly bad results. Maybe not as bad as Backblaze but pretty damn bad.

I absolutely agree though, the 4TB are a great improvement, you can't beat them for reliability unless you're really willing to pay for it. I've chosen them for my personal NAS and some servers even with great results so far.