Just to let you know I have a 2012 macbook pro running OSX El capitan and the latest versions of RM firmware and UC surface and I bought an Acer T232HL Abmjjz 23 inch touch screen and it is working using the thunderbolt 1 port with a HDMI adapter and 1 USB cable for the touch input. No drivers were required and it pretty much worked out of the box. Good and beautiful. I have it as a separate, not mirrored, display. The only thing to be aware of, so far, is that the cursor needs to be in the window you want to control. For example, if I have UC Surface on the touchscreen it will not work until I slide the cursor over to be in any part of the UC surface window. The macbook screen is then available for Capture or to run plugins via firewire. It is not battle tested yet but so far it is good and responsive.