Any of the 144hz Asus gaming monitors have an electronic sight (4 actually) that is part of the monitor you can activate if you want, instead of using a marker or piece of tape or whatever. It only really makes a diff IMO with planes that you can move the seat up past the stock AH sight center - example, the K4 you can't push the sight out of the reflector completely, but the KI84 or the Mosquito, you can really see a whole lot more over the nose, or beside it even, if you move crap around. I find it too disorienting to do that, heck, I even still have to switch off trackIR in a fight as I find old habits and my hat views faster for me.
But it does represent an advantage that many use I think, for more accurate shots over the nose when pulling G while shooting.
I've had 3 of the 24", one of the 27", and now the 27" 1440p Rog Swift, and all have this gunsight capability.
