I've been using their large HDD for my NAS and haven been disappointed. Just wish I hadn't bought five of their 6TB drives only a couple of months before the 8TB came out.
Mind you this was a few years ago, but I was in charge of project of changing out hard-drives. Half of them I went with WD, the other half SG. I didn't have one WD fail over the next few years...SG I had multiple fail. Ever since then I only buy WD.
But this was obviously not a scientific test. Maybe that particular model of SG was just bad. But I dunno, that's my biased opinion for what it's worth lol.
Depends on the line you buy. Driving I'm buying are their professional ones with 5 year warranty. Haven't ever had an issue with them.