From the beginning you feel the stiffnes of the structure. They are difficult just to place on the rim (keep in mind, good tools needed). Driving you really feel everyithing from below.
Grip is quite good, but at the limit it drops quite fast, there is not such a good transition. They are still predictible, but it is a little more difficult to be consistent on a good lap time. In dry they warm up quite quickly and may require some pressure adjustment on track to avoid having too high air pressure. In these cases the tyre starts sliding a lot.
On the other side, no much heat is needed in case of rain and if there is not much water they have quite a good grip. The outside longitudinal channels should go closing with tyre wear, so I expect some more reduction in aquaplaing performance.
Comfort is not what they were ment for. Suprisingly they are more noisy as new than after a couple of trackdays.
Wear: they are not the softer ones and they not really get like glue, so the initial feeling is that they may give some reasonalbe milage.
In summary, a plus for the decent grip when cold, I like to steering feeling within the limit. Just not completely convinced from the feeling when the grip break
(91Y load-speed codes)