Thought I'd post some feedback on the S20s.
Hard to explain really, I don't know what/how to feel grip etc; sounds daft I know. They felt odd really - the Rosso Corsa on there before felt light, flighty and quick to respond, but the S20s feel.... weighted. It feels odd, like my wheels are notably heavier, not sure whether steering feels slower or not yet, as I was being careful scrubbing them in.
On corners it felt as if I were riding in troughs, or "on rails", maybe that is what grip feels like? Maybe having a rear tyre that has a profile in the middle, rather than being flatter is adding to the odd feeling...
I did find that slow speed stuff, like mini roundabouts were noticeably harder to navigate, it felt like turning was really heavy/slow.
Jury is open for now...