I first visited the Mesa store last year (I'm from Orange County) and fell in love instantly. Insanely good food and message of the brand- that's awesome!
Back in AZ recently, I had to go back for a visit. Had some impressions that might help. Food was excellent of course! I noticed only 1 cashier up front- he was short handed. Every table was full, big line and it took me about 15 minutes to get thru to phone in an order. Would recommend staffing up the front. Back of house, 3 cooks looked plenty.
Also, napkins were out at the soda fountain. Cashier confirmed store had run out of supply. I would've filled all this out on a comment card, but those too were out of stock.
Anyway, keep up the good work. I will still be back and hopefully these are some easy issues to address.