Reading from their website they have built a vr sim from the ground up now...versus an addon to fsx or psd etc. This enabled them to create fully functioning cockpits. It's interesting...not quite there yet but exciting new times. I have trackir and this is totally different...you actually reach for the controls and get haptic feedback when you pull the yoke...turn knobs etc. Super cool.
I think vr sim should have its own category actually.