Which if any of the BPC Denon dual cassette decks are any good?

[Mark W.]

The local GW has a couple of Denon dual Cassette decks a model 580 and 850 are either of these outstanding. Both are under $15.00 but I don't have a need for a Black cassette deck or any more unused junk piled up around here (haven't seen most of the floor in a decade)

BUT if either of these is a really good deck I could find a use or pick it up for a gift etc.