We bought this and another bike of the same model, but with front suspension and 7 speeds. He's ridden it a few times, and it'l fit him better this year. My issues with it are the extra weight and the suspension fork. He doesn't weigh 50 pounds, and the fork seems set up for someone over 100..
Here's a picture from the day we picked them up. They were pretty beat and neglected, but $25 for the pair was an easy decision. I've since overhauled both, but they need a repaint.
His old trailer bike is a 7 speed, so he has some experience with geared bikes.