well i cant really give a comparative view, since ive never owned a car with "good" tyres before
i've got the T1-S on the baack and they give GREAT traction in the dry, and almost-great in the wet.
the fronts obviously arent used for accelerating, but under braking the grip better than anything ive experienced before (but then as i say, ive not had good ones before

) even in the wet.
the do seem to wear quite quick tho, the backs are looking rather worn after only about 4 months use

but then that might be due to my driving style, i tend to spin the rear wheels whenever possible
ps ive got T1-R on front, T1-S on back just to help aleviate any confusion