I bought myself a Viewsonic VSD-220 to use with my little Titan One laptop rig, and managed to get it functional with a Pearl Expert Pro today, as well. It's great! I wouldn't recommend the Viewsonic after using it for a few weeks, as the Android OS built in and lack of a properly sized HDMI input has proven to be annoying... for ease of use, try to find one with a VGA input!
When I plugged it in at first, the touch drivers with the Windows 7 build seemed to not be working, but it turned out that I had to use the "Tablet PC" section of the Control Panel to calibrate the touchscreen and teach the console which one was being used.
Apparently, the Touch Wing display is "Connected" or the window is "Open", even though I do not personally have a Touch Wing connected to the Pearl. Some dialogues, such as the resolution change dialogue box, seem to show up on that unseen display, which can be annoying. :/
However, once I got it all sorted out, the touch functionality is certainly helpful. It's great for fingerpainting custom logos for all of my buttons!
