So I test fit my Acadia Mat inside the Traverse and ... as I suspected, the curvature of the interior walls in the Traverse cause the Acadia mat to not lay flat in just the corners. You could easily trim the mat to fit the exact shape, or as my wife said, it really wasn't that bad and she could live with it. The Acadia mat does say "GMC" on it, but sells for about $65 on Ebay usually. Or Check out
http://www.gmpartsdirect.com/results.cfm?singlepart=1&AddPartNumber=17800715&partnumber=17800715, they have it for $47.32.
... Some Acadia users actually cut theirs so that when the the 3rd row seats are up, they could simply remove the other sections and store away instead of having to fold up the entire unit and have this somewhat lumpy 3-section piece on the 3rd row floor. Just throwing out options for folks. To each their own.