I'm just lucky, I guess: took me all of fifteen minutes to absolutely love my old TrackIR 3, and I've never had any problems with dizzyness from it. Upgraded to the TrackIR 5 a few months ago, and very happy with the improvements that NaturalPoint has made. The "6DOF" lets me lean around canopy frames, which is critical to me in planes like the 109 and A6M.