Why? What's good about 'em?
I don't even use the offensive term "Fred." -- Sheldon "All Cyclists Are My Friends" Brown (1944-2008)
I do like the idea of being able to see the kids. I've had to stop more than once and moderate disagreements. The one downside is having a dedicated bike just for the kids, as I'll unhook the trailer and go for rides alone sometimes. Would be very cool if lived in city and commuted with it.