I currently have a T2 Tracking Computer on a Kronos and have a turret tracking speed of 0.02033.
If I upgraded to a Federation Navy Tracking Computer running a speed script, my turret's tracking speed is increased to 0.02111.
So, is it worth spending all that ISK? How much benefit will an extra 0.001 (radians??) mean to me? Will I then be able to hit orbitting ships at a closer range? What sort of range would we now be talking about? 500m closer to you, 1km, 5km?
Is there any tangible benefit from upgrading a T2 Tracking Computer to a Faction Tracking Computer or would you just be wasting the ISK for pointless bling?

Little bit of geekness here for you: linear velocity = radius (metres) x angular velocity (rad/second). So the increase of 0.001rad/s in angular velocity (eg how fast your guns track) is worth a transversal of 500x0.001=0.5m/s at 500m, 1m/s at 1km or 5m/s at 5km. So…. really not worth it :D