I hope it is OK to post this type of thing. Please let me know if it is not.
I have had my 6D for a year and wanted a grip for it. The OEM version is just too expensive for the little bit I'll be using the grip. I have purchased and returned three of these things so far. The first one was DOA. The second had issues with a battery door that would not stay closed. The third (I actually tried 2 copies of this one) worked fine with Canon batteries, but would not work with my Wasabi batteries that work just fine in the camera.
I figure that others may have had the same issues. I finally got one that just works. Fit and finish are good. All buttons work as intended. The grip mounts firmly to the body. I did not try the "AA" battery tray, as I never intend to use it. The grip is a: DSTE Pro BG-E13 (BG-E13 Replacement).



