I got TrackIR in time for last Thursday's Flight Night, and it really is good! My flight back to base was done at low level following a railway - before I'd have to punch up more often than not but I could stay lower and for longer by easily turning my head to suit the situation. That said, I still crashed but that was because I'd got to external view.
My next vally-busting flight will be much improved with it.
The only downside to it so far, and it's probably just because
it needs tweaking at my end, is in the cockpit I'll look toward a button I want to push and the slightest movement of my head then makes me have to chase around with the mouse - again
, also looking at the bottom l/r panels (ground safe/lighting, etc.) was difficult - I had to really contort to view correctly - again it'll just need tweaking I expect. The first issue with full HOTAS wouldn't be a problem I expect.
Just need to remember your button setup.
Previously I'd tried FaceTrackNoIR, which just uses some free demo (not time limited) software and a normal unmolested webcam - and it didn't work for me - the setup software worked and I could track head movement well but in game it didn't work despite having a specific DCS A-10C profile done by DCS, also it screwed my Steam install. I didn't try FreeTrack but a friend has and said it works fine - but he's still going to save to get TrackIR in the long run.