Not only Seagate may be the least reliable, but it's hard to get them exchanged. WD drives do fail, especially Green drives have been a headache, but then WD will exchange them without question. Seagate, on the other hand, would require Seatools report. According to Seacrap, multi-terabyte drives can have thousands of reallocated, irrepairable sectors, and due to them - tragically bad performance, but if Seacrap says it's ok, you're SOL - like, it's working, is it not? Only true mechanical failures (calibration retries, seek errors, ) are a given.
Not from me, I went online did a warranty status check, from that clicked to order a replacement, printed the shipping label, read the packaging instructions, packaged & shipped it - received teh replacement 8 days later.
I'd call that pretty hassle-free (except the ridiculous requirements for packaging!)