These days I don't know if that's entirely true, so I would at least look at reviews to make sure.
Anecdotally, Corsair has always been a top-notch company to me. Even when their products go bad, their support is awesome. I had a set of memory sticks appear to go bad, but I couldn't tell if it was my northbridge or the RAM itself. I was a cash-strapped kid, so I didn't have another machine to test with. Corsair sent out a set of known-good RAM sticks for me to test with, at completely no charge to me. When the test revealed that it was indeed the RAM that was going bad, they offered to let me keep the test sticks they sent me until my replacement came in the mail.
The OEM for most of their PSUs is CWT, but they are "Corsair custom" designs instead of off-the-shelf. Seasonic is only used for relatively few of Corsair's models.
Only one out of ~ 10 I bought ever failed on me, and that was after 2 years of no usage.