I am member of Q-Club in Quiznos home website. They ocassionally send me emails with links to coupons. I usually go the Quiznos on airport boulevard and never had any issues with them. I moved and I started going to this place instead. But they did not accept my coupons for no reason. Now, if I want to eat at Quiznos, I go to the Airport Blvd one even if it is little farther. Apart from this, I don't have anything good or bad to say about their service.
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