Update from me on the harmonic damper now its been on week and I've done a few miles with it.
For me, it does make an improvement to the suspension noise, from the rear sub- frame, noises are more subdued and it just seems a little more solid.
Road / tyre noise, again i think there is a very slight improvement but very much dependant on road surface, on quiet surfaces, it seems to be even quieter, however on noisy surfaces it doesn't seem to have had that much of an effect, i guess down to noise frequency and how it transmits through the car.
Only solution i see for that is sound deadening, expensive

or turn up the audio,

free, which is what i will continue to do.
