B-Boy carts

Has anyone here ever had the distinct pleasure of getting a shopping cart with all four wheels capable of independently rotating? Most of the carts I've gotten have the just the front two wheels free, meaning then can essentially just turn left or right, like an automobile. But man, when you get your hands on one of those luxurious babies that have all four wheels free, that is sheer shopping bliss. There is something liberating about being able to spin your cart 360 degrees as you walk, or push it down an aisle completely sideways. They are like the breakdancers of shopping carts, freestyling their way up and down the aisles.