I use an Emagin Z800. I've been using it for about 5 years with Aces High. It has dual 800x600 OLED that give you the feeling of looking at a 21" monitor from about 2 feet away. It has 3 axis head tracking (aka 3DoF). There is a driver for it to emulate TrackIR. I set my tracking up to about 1:1.3 ratio (ie if I move my head 60 degres to the left or right = 90 degree left or right view)
Sure the 800x600 is a bit of a loss, but you gain in immersion and stereo 3D. And in knife fights stereo 3D can give you a good advantage in understanding relative E (you get a better feel for what is going on).
Also as above 800x600 in a VR headset is difficult to compare to a big hi res monitor. Your eye only focus's on a narrow field (6 degrees IIRC). Imagine this, you are reading this text... now you want to read the text at the top of the screen, you either move your eyes or head to focus there. So if you have head tracking you're doing the equivalent of looking at a small section of the monitor then moving your head to look at another part. You cannot easily compare the resolution 1:1 because of this (sorry if it's confusing, it's hard to explain and late for me).
The new unit I have my eyes on is this:
http://www.vuzix.com/consumer/products_wrap_1200vr.html . It is supposed to have 6DoF tracking, plus independent diopter adjustment and the res looks good too.
AH with VR is a quite awesome experience, but VR is not for everyone (especially if you suffer motion sickness)
Oh it cost me us$599 for mine. I also have zoom mapped to a rotatory on my X45 throttle, and I use the X45 'rocker'/rudder on the thottle as lean left/right. The only caveat for me is I'm left eye dominant so the the reflector sight is not center, so I need to adjust my aim (aim for the left wing and I hit fusalage).
