You can also set the TrackIR with a limit on how far around your head will go. For example, when I look up, I set it so I cant look up and farther than 100 degrees or so from center, or when I look side to side my virtual head doesnt twist any further than 180 degrees. This way I dont feel like someone from the exorcist and everything feels very natural, well mostly.
I have a small dead band in the very center of my view for all axis. Makes it much easier to aim, and I dont get dizzy from my virtual head constantly moving, because it doesnt when it's in that dead spot.
As far as would I buy it again? Absolutely. I accidentally broke my pro-clip one day and I didnt fly for a week and a half while I waited for the new one to come in, simply because flying without it just doesnt feel right anymore. Well, that and my HAT is used for trim now, not views.
The SA it gives you is unmatched from anything the HAT views will give you, and it makes tracking your target very easy if it is set up correctly.