My first TR6 had Sprints on it. I drove them in all weather conditions except snow. They were durable, but I never felt comfortable with them in the wet after a near collision on a club rally. Maybe mine were older when I bought the car, but they always felt hard. Similar to a redline with wider grooves and no red.
I have been running Kumho lately and am quite pleased. Inexpensive, yet a quality tire.