I recently had my 141 professionally calibrated by Gregg Loewen. This was after the 100 hour factory break-in, 150 hours with the break-in disc, and another 50 hours or so regular viewing.
I was able to notice a marked improvement right away, especially with the deepness of the blacks. IMHO, Gregg did a fantastic job, and I would recommend him and Lion A/V without hesitation.