Interesting letter... curious, why the "guarantee" to place an order for Aerosmith? That has zero to do with your current situation. You want communication and resolution.
In fact, have you seen pictures of BM'66 exhibiting chipping in the shooter lane? If anything, I'd think you'd want to steer clear of Stern products until its re-establish quality out the door. You've already received lip service that you've found unsatisfactory... the fact that you're willing to shell out another $5 to $8K just because of more lip service doesn't exactly do much to telling the company that you truly demand more for your money.