What do you use case mounted touch screens for?
I can see that most of these displays commonly have a native resolution of 800 x 600 and a maximum supported resolution of 1024 x 768, so to clone the primary display onto the touch screen is not a real option, as most of us have a television as the primary display with a resolution of 1920 x 1080. Also, I read that the included playback software (usually from Imon) is not particularly good or useful, just like we all have our own favorite playback software (WMC, JMC, XBMC, etc.).
It would be great if you could play music, with your primary display off, and use the touch screen to control your favorite player, but I can not see how this is possible. Is there something I have overlooked or are you using them for something else?