I have never used one hunting, and currently do not have any, but I have had them and can say that they generally are more comfortable and you have a more stable grip, which means better accuracy. Choate, Speedfeed, and Black Warrior brands are good, Advanced Technologies looks great but I'm not sure about durability. Choose on the basis of ergonomics.
Benelli does offer a version of their Super 90 in camo with a black pistol grip like their tactical models. I saw one person using one on the outdoor channel.