@a-scho
I cannot speak for Tustin. The fashion island location was busy enough, they moved it down to center food court and expanded it to have a full bar as well. The HB and Costa mesa locaitons are busy. There is now one somewhat close to the Long Beach airport. Wahoos has much more variety to offer than Chipotle does.
I will always be partial to Chipotle as I have a significant amount invested in CMG and seen it do very well. Chipotle tries to be the burrito version of In N Out. Limited menu, quicker service and reasonable prices. It's too bad they have had some of the issues over the years plus losing their CEO last month to Starbucks might not help either.