I've joyfully used 3rd-party grips for 40-, 50-, and 7D for the longest time. I started with a canon grip on the 7D,but when the battery door failed I bought a polaroid branded one which added features: an intervalometer & remote control amongst them, at a fraction of the canon price, and it seems a lot sturdier, and has lasted me more than twice the life of the canon. I enjoyed similar results with the xxD grips.
HOWEVER:
I bought one for my 6D and quit using it after a couple of months. When I used it the camera exhibited various malfunctions including freezing (shutter not functioning on camera, turning itself off, shutter sticking, and not awakening from sleep mode. Missed several shots. It wasn't the 3rd party batteries which were marketed as chipped for 6D, as they have continued to work once I ditched the grip...
HOWEVER:
I bought one for my 6D and quit using it after a couple of months. When I used it the camera exhibited various malfunctions including freezing (shutter not functioning on camera, turning itself off, shutter sticking, and not awakening from sleep mode. Missed several shots. It wasn't the 3rd party batteries which were marketed as chipped for 6D, as they have continued to work once I ditched the grip...
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