Nobody yet answered my question, can you still reach and work all the controls with your hand on the grip with all those larger ones?
I tried a couple of the Ergo's when the first came out and they were a little to big for me to do so. Their "sticky" or "grippy" version just constantly weeped some sort of oil too, and was always messy and more slippery than sticky. The plastic version was OK, but again, to big.
The standard AK grip works fine for me, I usually just add a small piece of skateboard tape to the front of it. You can easily control the gun and sweep the safety off with your hand on the grip, and also reach and drop a mag the same way.