Summary: Received it yesterday, put it in my EOS 5D ii, works flawlessly, all the buttons function well, and I didn't feel any shutter lagging. I like it, giving my camera a cool new look. attached to my camera, it feels solid, compared with OEM product price, this one is really a good deal.
Summary: does exactly what I want it to, only a fraction too slow, my primary source of media comes from live entertainment where I need to be fast, this delivers at speeds I need some of the time, but not always. I would recommend for anyone who needs longer battery life, avoid non-Canon batteries though.
Summary: Le grip ne quittera plus mon appareil. C'est un outil indispensable en portrait. Pour ceux qui on de grandes mains, même sans faire de portrait c'est un grand plus, on tient beaucoup mieux son boitier.