Will they sound good? Not at all likely. But "Content is King" and if there's some music there they you don't have in other media, it could well be a hoot to get a cassette deck to check them out.

I have a few of these Teac Cassette Decks that I use for duplication; they've done fine for me.

::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::