Stop Tech Floating Rotors

Has anyone tried these cross-drilled, floating rotors by Stop Tech? They are sized to fit the OEM brakes, available at www.zeckhausenracing.com. They are a lot more expensive than OEM discs, however. The Zeckhausen site says $1050, but I can't tell if that is $1050 each or $1050 for a pair (as the pic shows 2). A set of slotted, floating Girodiscs are around $1800 (for four) and Ricambi has OEM discs at $248 each.
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FWIW, I confirmed with Dave Zeckhausen that the price is per PAIR. Also, they are a floating rotor design utilizing an aluminum billet hub. The advantage is that they weigh maybe around 5 lbs. less per rotor, the disc can expand and contract with heat expansion independent of the hub, and there is less heat transfer from the brakes to the bearings. These are all good reasons to swap to these over OEM, despite their price over OEM rotors. Don't get too excited by the weight savings. They are all or mostly in the hub area, which doesn't make as much a difference than weight saved in the wheels and tires. But, for people who spend $$ for titanium lug bolts, only to save maybe 2 lbs., also at or around the hub area, this is still pretty good.