Mine is flat but I remember reading about at least one other that arrived warped.I am sure Music Direct will replace it with no issues.
New Funk Firm Achromat Warped
I just got this mat for my SL-1200G and one side is warped. The mat comes with double sided adhesive discs to secure the mat to the platter. However, the adhesive is not able to hold the warped side down. Just wondering if anyone else has had this problem. I purchased it from Music Direct, I will contact them tomorrow.