To clarify for readers the Cinema Displays that will work nicely with the product reviewed would be two of either of these:

2008 – Apple Cinema Display – 24-inch (2x1920x1200)
http://support.apple.com/kb/SP502
2004 – 20 and 23-inch Apple Cinema Displays (2x1680x1050 {tested setup} or 2x1920x1200 in the 23-inch)
http://support.apple.com/kb/SP79
This last product uses DVI so the other GXM units referenced should support this.

This is not a guarantee by Architosh. Our understanding of the spec literature tells us these units should be supported. Inquire directly with Matrox for exact product support coverage.

Again, for increased flexibility we recommend non Apple Displays which will give you choices in your resolution settings with the GXM units.

Dell and Eizo (http://www.eizo.com) are good recommendations for monitors for your Macs. We hope that Apple will improve its monitor options in the future.

A better scenario and one I should have emphasized more in the review is to NOT use Apple Cinema Displays unless you have older ones like I do. Instead, a Dell UltraSharp 24-inch (U2410) with IPS technology is not only physically much larger than my twin 20-inch units but offers 1920×1200 pixels across each screen and will maximize the Matrox GXM unit reviewed. And it will do so for $800 less than buying two 27-inch Cinema Displays. Two of these units means nearly 2000 pixels for each application running off the Matrox GXM unit displays plus you still have your laptop’s display for other applications.