I've got both TrackIR 4 and DK2 and tbh I've gone back to the TrackIR 4.
It's true the DK2 makes you feel your 'in' the spaceship, looking up and down and around is superb. You get a feeling of space around you unlike anything else.
I did love the fact I moved the throttle of my HOTAS and as I looked down, my avatar in sync moved the throttle. It was at once engaging and quite disturbing!
However take that away and you are left with incredibly underwhelming graphical fidelity inside and outside of your ship that breaks all the amazing immersion you get with this sense of space. Issues with sharpness, colour, the 'gauze' effect you have over everything that just reminds you are playing a game while looking at a Note 3.
I get bad chromatic aberration on almost every single star, stations are a fuzzy mess until up close, and the whole thing becomes quite an unpleasant experience IMO.
I understand this is an unfashionable view, as we are all supposed to be head over heels with the DK2, but the tech needs to mature quite some way before I feel the same way.
So I went back to the TrackIR 4, which is a big step up from fixed view (impossible to go back once you do some form of headtracking), and I can see the game in all its glory in high fidelity. This is much more important to me than being locked inside a fuzzy spaceship with fuzzy roids and fuzzy stations fuzzing past me.
For immersion and a unique and incomparable experience, OR is the future, no doubt. But right now I would rather take the headtracking solution any day of the week.
I should point out that a number of people in the OR thread felt that yours wasn't set up correctly.