Hi,
cant say about those reviews, and cant even trust all of them. i've been using seagate's 160GB free agent Go for more than 2 yrs, seagate's goflex 500GB for more than 4-5 months, and seagate's laptop hdd 500GB as a portable hdd for same time, but till now all of them have been working flawlessly !
recently bought a WD My Book Essentials 1TB USB 3.0 ext hdd...till now no problem...
i think if you care for your devices properly, they wont bite back on you with problems, unless until its some unforeseen kind of issue. you can go for seagate/WD eyes closed; best brands for storage solutions ! seagate's preferred as per my personal opinion (since am using WD for the first time now)....
happy buying
!