I'm a new user of TrackIR 3 Pro and Vector, and everthing was easy to setup and it works great, as advertised.
My small problem is that the Head Window is bad when FSAA is enabled. (I see no heads, just lines)
This is with latest Forceware on a 6800GT.
This is no big deal but it's a little annoying.
I'll try the new Direct X button in 4.0.23 tonight. Great addition!!!