There are the pros for you Honk Shooter. I've never shot with them for any number of shots. Just shot a buddies gun a couple of times with it on there. The one bad thing I have heard about them is that you start aiming to much with them. Wingshooting is not like shooting a rifle at a stationary target where you have lots of time to actually aim. You want to pull the gun up, look down the barrell, and shoot.
This is just something I have heard, but can't say one way or the other for sure.