I have just the regular dualhead2go Digital for my Macbook, which, on Mountain Lion, I had set at 2880x1400. When I installed Mavericks, 2880x1400 was offset and stretched out like crazy. I couldn't get any resolution to properly display across both monitors. (And it didn't help that the Matrox Powerdesk software crashed when I tried to use it to set the resolution.) But I was able to use other software like Display Maestro and SwitchResX to change the resolution, but couldn't find one to work. I need the extra screen for work, so I had to go back to Mountain Lion for the time being, but I would like to take advantage of the dev. preview. Anybody have any suggestions?