We have found inconsistencies in the quality of the birch plywood sheets. Some sheets have patches and/or pin knots on both sides, disqualifying them as B/BB. Also, we have received discolored sheets, appearing as if they were at the bottom of a pile in contact with a skid for a very long time. And warping has been an issue. At the same time, we have received boxes of the same grade of plywood that were perfect. This might not be an issue for those building cabinets, but for crafters, finish and consistency are a requirement. Shipping time has been excellent.