I have been to Cheeburger at least a dozen times, and now that they have changed it to be "express" I can confidently say I will never be back. I got maybe 12 fries with my burger, and for one burger combo (fries/drink) and an order of fried mushrooms to come out to be $20 is absolutely insane. You have to refill your own drinks, nobody checks on you... fend for yourself. My meal was tasty but it's hard to praise the food for the cost.
I don't see this business model being sustainable for very long, it's a complete change for the worse.