I just purchased a second hand AP Electrix Load Cell mod for my G27. http://www.apelectrix.com/index.html
I have found that the only issue is calibrating it to a locked standard. You see when you press down on a potentiometer pedal it looks at the range. All the way down is 100% and all the way up is 0%. Everything is peachy.
The problem I have with this load cell is pushing down with 10 lb/s of force will automatically make 10 lb/s of force 100% brake and 0 lb/s of force 0%. And that will remain true until I apply 12 lb/s of force during a race. Then 12 lb/s becomes the required pressure to get 100% braking. Now the REAL issue comes when in an emergency situation you apply 8000lb/s of force and all the sudden you need to apply 4000 lb/s just to get to 50% braking force.
That means at any point the required pressure you need to apply to slow for a corner can change. Is there any way to adjust / lock either the Logitech software down or anything in rFactors ini's to prevent this? I don't believe so.