Ok, first up this is a personal opinion, and so take it as such. ED is THE game that makes VR dreams come true, I have both the DK1 and DK2, I didnt play ED with DK1 simply because I had read the text was unreadable, and so I didnt see the point.
However in the DK2 the game is bloody glorious, I cannot and will not play the game on a monitor, ever... even 4k 8k whatever..... sure the detail on a scren maybe better, but its only a screen.
Here's the rub, in the DK2, yes the text maybe slightly blurry, yes the overall image has a look as though you are looking through some muslin. But I can lean forward and the text is clear, I can also track any ship in visual range while easily maintaining a different heading, I can get up out of the seat and look around the cockpit, I can look out of the window and see my ship from angles not possible from the seat alone. I can wear the Rift for hours with no discomfort, no nausea, and because I have X55, & Voice Attack I don't need a keyboard (though I honestly prefer typing star destinations rather than trying to spell them verbally), and I only use the mouse for the Station screen.
I cannot explain this sufficiently to non-rift/VR users, there is no measure or comparison I can give that will help get it across, all I can say is if you know anyone with a Rift ask for ANY demo, seeing really is believing. The ONLY caveat I would offer is that you need a fairly powerful PC to run the DK2 with decent graphics and no stutter, etc. Bear in mind the bare minimum fps is 75 with the equivalent of 2 x 1080p screens, lower than that and you run the risk of spoiling the VR experience and potentially making yourself sick.
Regards
StuPer