The Co-Motion Periscope is another good choice for riders of very different sizes. We bought a used 3 y.o. bike 14 years ago. It's a Co-Motions Speedster. We got it for about half of new retail at the time, so $3000. It still runs perfectly, though none of the drivetrain is original. Stuff wears out. We have many, many thousands of miles on it. It's still a perfect bike for us. I spent almost 2 years scanning used bike ads before I found just the thing. You don't want to buy too old a bike because of future spares and maintenance issues. Thus a bike you'll love for a long time is probably going to cost more than $1000. Our bike was in perfect condition when we bought it. We changed out the tires was all. That's a good thing. Tandems are more complicated pieces of machinery than single bikes.