I converted my 24V MK4 to the Valeo solid mass flywheel kit, I won't do that again if I had the chance.
Gearbox rattle(chatter) started, I know its not harmful, but its annoying, the car is silent and this just takes away of the charm of the car (also takes away the smoothness when changing gears).
Also, changing gears becomes more "solid", its fun if you go out for sporty driving, not fun at all for daily driving, also when taking off you'd need a bit more RPM and hold them a bit longer if you want the smoothness that you had previously, basicly it makes the car a bit harder to dri