You`ll be ok as long as you use them with warmers, as tyre man says they take a while to warm up properly as much as five laps which with some trackdays can be a large portion of the session.
Not really advisable on the road either Ray. you`ll never get them up to the temp they are designed to run at on the road and if you get caught out and the weather turns wet they`ll get awfully slippy.