Yes ask for the name and brand of product he uses, ask him where his supplier is located. Ask for business license and references and insurance info. Check to see if he has been in business very long. Many folks go around with a truck looking for business offering a huge discount to get it done now. They usually dont have a business license, offer any guarantee, and when something goes wrong they are never heard from again.
He quoted you approx. 7 cents a foot which in my area is fair. Not a real discount. Although I would suspect that later in the year you will be looking at at least 10 cents.
Be sure to get references and check them.