Umm im not so happy with overclockers RMA service, but at the same time am, it comes down to who you talk to there..........go figure, I had a leadtek 1000w Platinum PSU go with an almighty bang on me, it was about 2 or 3 years old at the time, still under warranty, so I rang overclockers, they told me to send it in which I did, a week later I rang them to find out what was going on and they said to me, "I dont know if you know how our service works, but we send it back to the manufacturer (Leadtek in Taiwan), they test it and send us a replacement which we then forward to you" all I could think was that is going to take months, anyway a month later I got fed up of waiting, so I rang again, this time I got another guy to speak to and he said, why the hell didnt they just take one out of stock for you and send that to you, we'll just get refunded for the faulty PSU you sent us by our supplier, go figure, got a new PSU the next day, still have it now, so like I said, it comes down to who you speak too.
If they have it in stock and they test the item and it appears faulty, they should just take a replacement for you out of stock, it makes no difference to them, they can just get the faulty item refunded or replaced to them by their supplier, and because of the above reason, thats why I use OCuk for some things and not for others, or make sure the parts you buy have UK RMA centres where you can RMA yourself direct to the manufacturer, cut the middle man out.