Sonic's food is pretty good. Their burgers aren't the greatest in the world, but, I like almost everything else they have. Sonic's is one of those eateries where you drive up to a monitor and park and place your order, then a carhop brings you food to you and you can eat in your car if you so desire. They're probably best known for their extra long cheese coneys. They have a big line of different slush drinks as well. They also have a lot of different desserts; way more than any other fast food place in the area.
They have a lot of specials pretty regularly, so sometimes you can get a lot more for your money, although they aren't expensive to begin with.
Here's their website http://www.sonicdrivein.com/index.jsp
This one is clean (mostly because you do not dine in), but, they are also good with orders (haven't been shafted yet) and they also don't over or undercharge. In that respect, I gave this Sonic the full 5 stars.