I think the Buddy Bike is awesome, really. It has fold down pegs for a kid who can't pedal. A 3 year old would be old enough to hold on if he/she didn't have to pedal, but I wouldn't want a 3 yo behind me on a tandem. My kids didn't get tall until 8 or 9, so that would be 5 or 6 years of riding. Then the next kid comes up...I think it would be very cost effective if you had 2 or 3 kids to use it with, or even one over 5 years.

I remember riding on the top tube side-saddle on a ten speed with my dad when I was little. It's a fond memory. I think the Buddy Bike would make the same kind of memories.

Karen