I didn't see any flaws with the grills off.

I must retract my last somewhat - I found a small flaw on 1 of my M3s. They were 'B Stock' Real Wood veneer that I won on auction as the only bidder (when that was happening at Axiom). I realized a tremendous savings - over $200 for the pair. I found it in the veneer (undoubtedly from the veneer factory) after protracted, close inspection under strong light.

Again, I was astounded that this was considered to be 'B Stock' - absolutely invisible in its normal placement in the room. I would defy anyone to find it...

TAM