I own a 5D III (bought it at an authorized dealer) and left similar feedback about the SD slot when rating the camera on Canons website. Overall I gave the 5D III a 2 star rating because I really felt it wasn’t much more of a camera than the 5D II. Canon would not post my review, i received an email saying my review was declined after review for it’s negative content. Negative maybe, but my reasons, such as the buffer being limited by the SD card slot, were not untrue.