If you manage to go every single day during the promotional period, you're looking at about $700's worth of food.
You'll need to register for their SmashClub rewards program/mobile app (if you haven't already) to purchase the Smash Pass. Then, starting November 5th, you'll get a one-day coupon on the app each day that can be redeemed for a free entree. The coupon can be redeemed for any signature beef burger, chicken sandwich, turkey burger, black bean burger, or salad.
It's a pretty nice deal if you happen to live near a Smashburger restaurant. Since there's a good amount of entrees to choose from, you're less likely to get tired of eating the same thing.
Photo via Smashburger.