I've shot several rifles with the ergo grip, and I like it. I found it to be to restrictive with gloves on though. I tried to get used to the standard A2 grip on my rifle but it just did not fit my hand.
I've got the Magpul MOE on my rifle now and it fits me much better with or with out gloves.
I have the Magpul Miad grip. I absolutely love it. I have very big hands so it is nice to have a grip that I can customize to make it bigger. Very rugged and I really like the storage compartment in it.
______________________________________________ Hellfire, Doom, Watch the hatred spin
Beyond the speed of sound---
Fire it up, Let the engines roll
It's time to burn it down