Most everything on the menu at DQ is made to order. They don't cook burgers ahead of time. They don't make cones or sundaes ahead of time. That's usually a good thing, unless you're stuck in a drive thru behind someone picking-up food for a dozen people back at the office. At other DQ's, I've sat trapped in a drive thru line too many times. Once for even 45 minutes!
Pros: Fast Drive Thru