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1. I bought mine from green-sum on Ebay, no problems and his feedback is pretty spotless.

2. the Catleap range takes Dual-link DVI, which requires the powered adapter for (I use Apple's one for the MBP, and bought an extra minidisplayport -> displayport adapter for my work laptop).

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So will a cheap mini displayport -> DVI adapter like this: http://www.monoprice.com/products/product.asp?c_id=104&c...

not work for one of these displays, coupled with a Macbook Air (2012)?

That will not work. You, unfortunately, need the expensive USB powered/assisted adapter. (I have both. Had to buy the other to drive the high resolution.)

I bought Apple's dual link adapter (http://store.apple.com/au/product/MB571Z/A/mini-displayport-...) . Was on special at a local store. It's not without problems, particularly awaking from sleep sometimes leading to "static" image blur requiring reconnection of the adapter.

Odd, I bought the dual-link adapter from monoprice and I thought I got gypped when my wife's Yamakasi Catleap would wake from sleep that way. I guess mini-displayport is just flaky in general.

When that happens, you can just put the display to sleep instead, then wake it a second later. That fixes the problem for me at least. The standard keyboard shortcut to put all displays to sleep is Shift-Control-Media Eject (⏏)

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