Ehhh.. we've experienced better Sonics. If you're in Charlotte and don't mind a drive, visit the one near Mt. Holly. Service was exceptionally slow and poor. Messed up my bill over 3 times and still got one of the items wrong. Mind you, it was only 2 milkshakes (coconut cream pie master shake, oreo chocolate master shake- they did vanilla instead of chocolate) and 1 slushie. One of the doors to the inside was supposed to be open, I guess in anticipation of closing (arrived shortly after 11pm, they close at 12 am) they locked them. The blonde opened it so I could use the restroom. Inside was dark, dirty, trash overflowing and a pool of liquid on the floor in the indoor dining room. Smelled funky. Inside the restroom, toilet paper and soap was stocked. Sink worked as well as one stall, handicapped stall was out of service.
Moral of the story, go to the Mt. Holly location.