actually, I don find my M sport 325 to be very stiff and bumpy. it still on rft.
I believe when it's on non rft, it willb e much better. Probably that's my level of tolerance.
Understand it's not the same with other people.
Don't think first. Test drive to find out.
Try it out on straight, corners, long hiway, rough road.
then only make your judgement.
Every car model is like a different person as they are made by human being.
They all carry their own set of strength, weakness, in certain balance/matrix.
Who knows after your test drive, you are willing to accept the weakness because it shine so well in it's strength???
At least to me, with that kind of handling, it is considered as comforatable.
Also versus my E46 325 standard set up, I find it even more comfortable but yet perform in corners, that's amazing, isn't it?