I have a 27 " screen and was wondering how effective would a Trackir be with just one screen ?

 

Very effective! I don't have TrackIR but use FaceTrackNoIR with an LED clip which works identically (and is free!) and it works perfectly with one screen. I wouldn't use FSX without it.

Most effective with a single screen.

 

The alternative to TIR would be a multi-monitor setup.

I have become so accustomed to TrackIR I can't fly with out it now. I have a 29" 21:9 monitor and its great. 

 

 

I have become so accustomed to TrackIR I can't fly with out it now

 

Ditto.

The alternative to TIR would be a multi-monitor setup.

But even then you would not be able to quickly look behind or above with the ease you can with a head tracker.

...can take some people a few days to a week to get used to it at first

and set it up to your liking but after that it is fantastic...

 

I never fly without it... that's like having forward looking tunnel vision.

 

aero

+1 all of the above

For me it is absolutely essential. Right up there with a registered version of FSUIPC4.

 

Without those two 'utilities', I would not be flying FSX or P3D !

 

 Paul

Is there a hit in performance?

Could not, and would not do this hobby at all now, without TrackIR.

 

and that's been the case for a long time.

Same here, I would not continue with this hobby without TrackIR.

Gamechanger, I am now on my third unit and each one is better than the last.

Is there a hit in performance?

Can't speak for TrackIR but FaceTrackNoIR with an LED clip has no noticeable hit on my very modest/old system (i7-920 OC'd to 3.6 GHz, 6Gb RAM, GTX 275!) using DX10.

Thanks. If there's no performance hit I'm in!

I tired using it and it just feels too weird to me.  I don't like the sensation of having to turn my head but my eyes are always fixed straight ahead.   I went the other way... I just bought 3 24" wide screen and went into surround mode for true head turning action.   XD