I have a marvellous Samsung SyncMaster SA850T which have the particularity to be a 2560×1440 mat display (mat and cheaper than the Apple Display).
To connect it to my Macbook Air, I thought I had to buy the Apple Mini DisplaPort to Dual DVI adaptor (http://store.apple.com/be-fr/product/MB571Z/A/adaptateur-mini-displayport-vers-dvi-double-liaison).
This adaptor is buggy. Every time my Mac wakes up, I’ve to unplug and plug back the Mini DisplayPort entry, because otherwise I’ve fuzzy or blurry or noisy screen. Moreover, this sh*t cost me 99 euros.
This week, I just ordered a Mini DisplayPort to DisplayPort adapter. It is a lot better! No more problems with the unsleeping event. And the best part? It cost me only 15 euros… (http://www.ldlc.be/fiche/PB00097925.html)