I have a guy selling me a 1989 Cannondale Tandem for $650. I am trying to bargain a bit but the guy does not want to go lower. He says that the bike is in good condition (was rebuilt a couple of years ago) and has less then 600 miles on it. He said that it was used as a rental but did not get used a lot. This would be our first tandem and size wise it is perfect for me and my wife (she has no clue I am looking into this, it will be a surprise for her, I hope a pleasant one). What do you guys think?