My experience working on the AD-WX727 and AD-wX929 twin decks, the latter returning for a second round left a bitter taste in my mouth. But they did produce some decent hardware in the same era and this, the AD-F500, is one of the more economical examples. It has proven itself to be competitive in its performance and good value on the used market for the right price.
Better than the WX727 in some areas, it does an acceptable job playing back pre-recorded tapes. But the best thing the WX929 has going for it is a few extra metal components which add to its scrap value.
reasonable sound despite its shortcomings in build quality. But proceed with caution, free is about £5 too much.