Derby rim cracked

Fun times. This after just 18km on these 26" AM wheels, and I only weigh 64kg.

The video.
http://www.mrmez.com/MTB/Derby.mp4
Jump at ~1min.

How did it happen?
Top section of Scorpion on the Kalamunda Circuit. If you can call them jumps, landed one a bit nose heavy, and when the rear came down there was a mighty crack.

On paper these are great, as were my first impressions. I know buying from OS can make replacements a bit difficult, but I'm left feeling disappointed in the warranty process.

Having done some 1,400km on a set on Enve AM wheels, despite severe landings, rock strikes resulting in pinch flats and destroyed sidewalls, not so much as cosmetic damage or even the wheels going out of true.
Even the rubbish Light Bicycle carbon wheels on the DH bike have been treated the same, but with a bit of soap and water, should pass for brand new.

So it's obviously a manufacturing defect, but I get told something like... usually you have to pay for a new rim that has impact damage, but I'll look after you and just charge you $80AUD to ship a new rim which will take longer than the usual 6-8 weeks.
How is this impact damage? As a gesture of goodwill for an obviously defective rim, I was hoping for a reduced rate on shipping ($80 is a bit steep for a single rim), and at least an acknowledgement that it IS a defect, and not just a paypal invoice for "Impact damage" with the cost of a new rim added on, then removed as a discount.

I'm not saying don't buy these... but if you have a 27.5 or 29, you can get the Ibis version locally, which are the same rims.