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I think I'd rather stick with head tracking...

I did some kind of rollercoaster thing, and if I'd own one myself I'd use it for similarly rollercoastery combat flight Sims, but the conflict between your eyes and your balance organ is real.
Other than that, it is real cool tho. Unlike what I had expected it really doesn't make your eyes hurt and there really isn't any screen door either.
But yeah. It felt quite nauseating every time the thing went to any other attitude than the real one.