Yeh, I noticed this. Didn't get it with my big order a few days ago, did get it with a much smaller order yesterday. So I think it may be a bit buggy!
Over the past ten years I've had 4 in my primary desktop. the corsair replacement was a misdiagnosed PSU issue. I've had about 4 builds across 2 cases. C2D, C2Q, i7 950, i7 3770k OCZ, Seasonic, and Corsair. For my next refresh, which is getting near I think/hope, I'll probably keep my PSU. For others, it's been usually, well this is old as hell, I'll replace it just because I can get a new one that's decent for the price, see my old Dell Dimension 2400, that now has a Gold-rated corsair modular PSU.
I replace the PSU when I replace everything else. And I only do new builds when I really have to. Only had one PSU die, and it had the good graces to die in storage.