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They used to be very nice tandems before tandem designs evolved into their contemporary configurations, they haven't been made in quite a few years, they make nice collector's items and they are good starter/fun to have around tandems if you find one that's relatively inexpensive.
There is one on www.tandemmag.com/classified
made in '81 that looks like a fine example for a collection (even though it's an odd size). However, if you're looking for a daily rider you'd be better off shopping for a '93 - '96 model year Cannondale, Santana, Burley or Co-Motion tandem that has up to date (i.e., easier to upgrade and find parts for) components and less radical geometry for about the same kind of money.