As I was looking through my local "used stuff for sale" site, I came across a fellow selling an LG 27-inch panel to which a touchscreen overlay had been added. He mentioned that it was the same screen that was used in 2009-2011 Imac 27's. Knowing that a touchscreen option is on many Mac users' wish lists, I decided to investigate. I quickly found that the unit he had was a PQ Labs unit. Upon perusing their website, it seemed that this had to be a G4S since that is the only 27" model the site talks about. A quick mosey over to their Support and then Downloads section revealed that THERE HAS BEEN AN OSX DRIVER FOR THIS UNIT ON THEIR WEBSITE SINCE DECEMBER 2016!!! Seeing that the seller was asking $80 for this unit, I decided to buy it on a lark (and I talked the guy down to sixty-five). This unit is USB powered so, when I got it home, I downloaded and installed the software, I plugged the unit into one of my Imacs' USB ports... AND IT WORKED!!!! ARE YOU FRIGGIN; KIDDING ME??? WOO-HOO! Back to Earth... One funny thing about it is that the unit used absolute referencing... unlike a trackpad or mouse. So, the habit of lifting the mouse off the table, moving it and then setting it down again to move the cursor has to be broken. So, if you want to click on something in the top right-hand corner of the screen, that is the spot you have to touch on the touchscreen overlay. Right now, it is still attached to the second 27-inch LCD panel which is not hooked up to anything. The overlay is attached to the LCD panel with two-sided tape. I have to decide whether I unstick the overlay from the panel with a hair dryer and plastic spudgers, credit cards, etc. (and risk breaking it), or whether I transfer the mounting brackets and cable from my existing panel to this one and install it into the Imac. If I do the former, I think I can stick the touchscreen overlay to the glass screen cover on the Imac. Conversely, if I do the latter, I think I can fit the panel and overlay into the Imac's chassis and even be able to install the eight Torx 10 screws that secure the panel to the chassis. Of course, I would not be able to use the Apple glass overlay and I would have a 1/4" to 1/2" gap on three sides to fill in with something (perhaps Canadian Tire automotive molding???... although I don't want this to look like a K-Tel product.) At any rate, I am completely stoked with this. If anyone has any ideas, experience, expertise, etc. to share, I would be greatly appreciative. If I judge that there is an interest, I will chronicle my progress (or disasters) in this matter.