Even if they don't replace a car, they're great vehicles. They're fun to ride, you rarely have to worry about traffic jams, they're cheap to operate, and you can do a lot of your own maintenance.

Does yours have seats on the back? A trailer? I've seen a variety of solutions for transporting kids. The trailer is the solution I see most often, and it looks like the most luxurious option for the kids. They often look like they're some aristocrat being carried on a palanquin, sprawled out and enjoying the ride.