Their burgers are fantastic, and the service is wonderful.  It's an unusual combination making the service staff suspect.  I'm not sure what makes them so cheery, and I suspect there's something going on....\n\nThey are always smiley, helpful, and bubbly, regardless of how late it is.  I suspect this behavior is insincere.  The Chandler location is open super-late, although they don't take care of the 24-hour professions like firemen, policemen, or hospital staff, which would've easily given them 5 stars.