3.5 stars!  Ok, it's fast food....that's why, but it's really good fast food.  We were heading back home and needed to make a stop for a quick bite to eat.  We pulled up and ordered the whole menu at those little old-fashioned speakers that are in your individual parking spot!  It was so cool.  Then the Sonic workerS brought out our food!  It was a neat experience; like going back in time.  The food was deliciOOOOso!  it was great.  my hubby had a burger and i had a chicken sandwich, fries and we sampled a drink...got a sundae and a shake.  We like to eat a lot, OK!  we don't have a Sonic near us, so we wanted to load up and try as many items on the menu --- we didn't go too overboard, but left feeling contently-stuffed.  the food was good enough to go back and definitely worth trying instead of sticking to Mickey-D's.