The game won't be produced correctly unless it has errors. But you have to confirm that it's only the expected ones. Even if you're up for a test disc, there's no point having one made until it sounds like they got it down to the correct format first. With Mysterious Song they said that a test disc must be purchased first, due to the unique format, or else they would not proceed. The salesman did drop the price though and a PCEFX forum raffle for the test disc (and a couple bonus prizes) covered the cost of it.