Someone posted on the TFSI FB group over the weekend it was the best £100 he's spent on the engine. GFB pulley. So that's 2 positive reviews so far
Did you notice any increase in vibrations the guys using GFB and Fluidampr pullies?
I think it would be a bit more beneficial if added to a lightweight flywheel to further reduce rotational mass, but the rattles would do peoples heads in!
I did all that years ago and I thing I noticed as well as quicker throttle response was improved engine braking.