When I have to RMA or warranty something I expect it not cost me one thin pence... And I know several people who have had to pay post to get RMA to Corsair... including one who won his cooler in a Corsair giveaway. And not only had to send it back once, but replacement which was DOA!!
I've dealt with Phanteeks, Fractal Design, Thermalright, Western Digital, Compaq and other and never had to pay anything out of pocket on RMA or warranty. Phanteks replaced my cooler with a smile, Fractal send HDD mounting screws I lost, Thermalright replace bad fan, WD sent me replacement HDDs with label for free post on my defective ones, Compac replaced 2 monitors the same way.
But I hear Corsair customers having to pay post, wait weeks for replacements, getting dead or defective replacement when they do finally get them, etc.
I have 2 Corsair TX v2 PSUs that are supposed to have "ultra quiet fan" and both can be heard from across the room. If I pay post to RMA them maybe after waiting weeks I'll get a quiet one. But what am I supposed to use in the meantime to power my computer?
Corsair banks on customers not wanting to pay for posting or having their computers out of use for weeks and therefore not bothering to deal with RMA and warranty.
Phanteks have people watching forums to help with problems and offering to send bits customers need. I've never seen Corsair doing this.