Here in Florida, we still have the old "drop in your change and I'll drop out a can" style machine. The benefit of this is that the machine pre-fizzes the soda, making it easier to spray all over your head on hot days.
What I'd really like to see are the really old machines with the glass door, where the drinks were in glass bottles and sat on shelves with the bottle caps facing you. Nothing like some super-compressed carbonated soda packaged in a bottle that might, just might, explode, with its metal projectile facing the consumer. I like a little danger with my sugar buzz!