As it happens, I've got 4S2 tyres on. I can't give you as full a review as I'd like but:
The car was on 16" Nokian Winter tyres before, and had got understeery, if pushed. I had thought this was the Nokians going off (the fronts did look a bit 'leaned on), but it is still there on the 18" Hankooks, so it is probably a suspension fault that I've got to find. I haven't yet driven them in sub-zero temps, so I don't know about that.
i) I'l be a lot happier when the understeer goes away. I thought changing the wheel size was going to be the thing, but it wasn't
ii) The change to 18s wasn't as bad as I thought it would be. While 16s are definitely more comfortable, you don't really notice on A roads/motorways, just slower roads in bad states of repair. In terms of noise, they are quite sensitive to the texture of the tarmac, with a coarse, open texture being noticeably noisier (but then, that's true of most modern tyres)
So far, my initial report is that I like them, provisionally, but I'll know more when Winter comes around (The Nokian D3 tyres were hard, for a Winter tyre, and if these wear as well, I'll be delighted, even if that does mean I'm losing the last tenth of grip, particularly in winter)
And I had decided I wanted to go all seasons, and saw the same review as you.It seemed to me, I'd lose a bit of summer grip by going to all seasons, and I wanted to compensate by going to a wider tyre.
My second choice would probably have been the Vredesteins.