I have a love / hate relationship with Sonic, in particular this location in Henderson.
On the plus side, it's open late (but not 24 hours), and service for the most part is fast and friendly. And sometimes you get the skating car hops which adds to the experience.
Dislikes: Kinda quirky to get in and out of off Boulder Highway. And their payment systems won't let you put the tip for the car hops on your card. You gotta pay them cash. And sometimes they get slammed so if you have little patience in the evenings this is not the place for you. And one another annoyance is people that don't turn their headlights off while parked so you can get dazzled while eating your food sometimes....
But nobody does drinks, shakes, floats, etc like Sonic...they don't even come close. A Route 44 Cherry Limeade, extra real cherries, easy ice hits the spot when few other things will on a scorching hot day.