My previous Corsair AX850 failed under warranty, i had to return it to Holland which is at your own cost, that was £24.75 UPS via parcel2go. As the AX850 had been discontinued so they sent me a brand new AX860.
I didn't realise it would be such a fast turnaround, with needing a power supply fairly quickly i bought a Seasonic 760W Platinum fully modular, the turnaround with Corsair was within 5 working days. The returns side of things was superb and very easy, don't think a customer should have to pay £25 though to return it when its one of their products that has failed.