Tried Which Wich today for the first time and was able to use my coupon (free reg sub w/purchase of chips and drink) which I received after signing up for their email/online offers. The sandwich itself deserves 5 stars, however, I'm docking one due to the poor customer service. Maybe these guys were just tired from working the lunch rush, maybe they've had a long day, but in my experience, nothing excuses poor customer service (please also keep in mind, I've too had a long day but was still able to thank you and smile). I've read about their stamp card, but wouldn't know anything else about it since it wasn't offered (and I just remembered as I logged back unto Yelp) :( Maybe next time.