We bought this so I could ride with our 9-year-old son who has low muscle tone and was unable to ride a two-wheel bike. He enjoys the front-seat view that he didn't have on a pull-behind tandem.
Amazingly, just a couple days after getting this bike, he started pedaling on own bike. He had been able to coast and balance without training wheels, but not pedaling yet. The Buddy Bike gave him the strength and confidence to put it all together.
This bike is also great for our long family bike rides together.
The bike requires slightly wider turns than a regular bike, due to the handlebar configuration, but balancing two people is not a problem. (Watch the video to see how easy.) All told, we had been looking at this bike for a couple of years, and it's exactly what we hoped for.