Mikey,
I have FSD's on my cupra with standard springs, they made a nice difference alright but I had bigger ARB's fitted at the same time so its hard to tell which made the bigger improvement.
That said, the FSD's are smoother than the standard dampers, less crashy.
My car did sit a little higher at the back when fitted but I think it had setteled since.
Neil.
i think thats what maybe happened to the vrs,when first fitted they sat up a little ,now settled its "seems" lower.