My grip arrived yesterday, and I'd say that there is a slight battery drain happening. I don't think it's the end of the world though. My main comment about the grip is that I find it quite uncomfortable to hold in the vertical position. Since it's nearly identical to the Canon grip, I'd say it's not the fault of the Pixel grip, but more my personal preference on comfort. A 1-series body would be a better option for me, probably.