I am interested in acquiring a tandem. before I drop serious cash I am thinking about getting a used one to try out with my girlfriend to see if we both like it. I found someone selling a 1987 Santana Tadem. I dont know the model name/number or have any pics. I am told it is light blue and has a mix of components including deore xt front der, sora rear der, and scott cantilever brakes. comes with mtb style bars and racks. Apparently this puppy sold for just under $1500 when new. Of course I will check it over but I know very little about tandems. Does Santana make quality stuff that I should consider buying one that is over 15 years old? What are signs of a quality tandem? what should I look for to make sure it is a safe ride? BTW seller is asking $500 which seems decent. Any thoughts? Thanks.