That is more than a little deceptive if he didn't clarify that it was a DIY F25! It might still be worth checking out, but I'm sure you would have asked a different group of questions before you set up the audition.
OTOH, if he has the true Rythmik driver and amp with servo, it may still be a good price for someone willing to build another box (if the seller's cannot be salvaged). But definitely one to pass on if you have no DIY desire!