Bull puckies! He's just trying to sell you a deck.
When's the last time you used it? and cleaned/demagnatized the heads?
I just duped 50 cassettes for a client using good quality consumer cassette decks with no problem.
Might have been a number of things, depending on the surroundings. Florescent lights, magnetic fields, you name it, but I'm sure it can be resolved.
Fixed & Mobile Studios
Pro Sound Sales/Installation
MacXPRT Network member