Sonic is one of my favourite places to eat because of the good, friendly service. They are pretty reasonable pricewise as well and you can either go through their drive-through or park and have your food delivered by rollerskating waitresses and waiters. Also, you can park and walk up to their window and order and eat at an outdoor table. I recommend that BEFORE the temperatures reach triple digits here in Arizona!
They have delicious choices on their menu and lots to choose from when ordering something cold to drink. They offer Happy Hour Drink Specials each day from 2:00 to 5:00 pm, so if you're jonesing for a Route 44 OZ Coke Zero to quench your thirst and you're in the area during those times, you can go get 1/2 off on that drink.
The only drawbacks are trying to get in there coming eastbound on Elliot Road, & I am not crazy about their breakfast sandwiches.