It seems my first answer went amiss?
Again, then:
I have Track IR 4, and I never have missed anything in it, so I think TrackIR 4 works fine for you, Oberon, if oyu can get it cheaper than TrackIR 5.
I have not forgotten your request about RoF and BS, but with all the system chnage going on, I have had little to no time to already have dealt with them in depoth. All I can say is both sims run smoothly over here.