I don't know how long they last- we just got a futon couch and futon bunk bed last year. The couch has almost what's like a down-mattress. At first we liked it, but it gets pretty flat and uncomfortable. We have a double-filled (i don't remember the exact terms for these) mattress on the bunk futon and is very comfy.
So I recommend, if you get a new one, to get the really thick (double or triple) mattress. Not the foam, down-like one. They'll go flat rather guickly.
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