not at all.
i have an original Grizzly. i thought about getting a second choked one for a bit, but then realized that for a defensive shotgun like this it is completely pointless. for the ranges i can envision myself using a Grizzly, cylinder bore is all i need.
i dont intend to hunt deer, turkey, waterfowl, etc with it so what does lack of chokes matter? its just another area that requires maintenance on the gun so im better off without it.
hunting with a 12.5 is, IMHO, a novelty. yes you can do it but in most cases you are much better served with a longer barreled shotgun - which most of us already have anyway. for the odd grouse chokes do not matter, in fact you want to minimize the amount of lead you put into them.