I have a problem with my left wrist where I cannot turn it palm up which makes firing a long gun interesting. This is the reason I use the vertical grip on the mini. I have one for the shotgun as well but I really like the look of the chainsaw grip. Using it conjunction with the pistol grip on my Maverick 88 would be ideal since it is strictly a HD gun and shooting from the hip.
I cannot find the damn grip for sale anywhere though.