I have the meike grip on my K5 and I can not fault it really. It is well built and is a good match. It is also weather resistant. It also has the green button and AE lock etc. All work perfectly fine ! It came with two extra batterys and cost peanuts off ebay. My opinion is it is crazy not to buy one if your in the market for one. I was surprised by just how well built and sturdy it seems. I expected it to be rather poor to be honnest. It is simply not though. I have a genuine one which cost a fortune on my nikon, but I would not buy another genuine again after this. Even though the buttons work fine I dont use them anyway. It just affords a more comfy grip for me.