I considered the Pixel, which is the only third party grip with a thumbstick, but decided against it because I carry my body with a Sunsniper - that is, from the tripod screw. I didn't want to take a risk and went for the full metal body from Canon. Also happy that I didn't get confronted with the battery drain issue, although that supposedly is fixed in a new version and if you're a careful shopper, that shouldn't be a problem.
Anyway, the Pixel is an insane lot cheaper than the official one. If I used an ordinary strap (and/or if I'd had a slightly more adventurous personality) I'd probably have gone for that one. Oh, and the settings wheel is rather tight in my BG-E11, I don't like that too much - but I haven't touched any of the others so I cannot compare 'em, sorry.