ZPBMW

I have a Benelli Nova Tactical and would like to put a Mesa Tactical 8-shot side saddle on it. I was thinking about having the Nova drilled and tapped at my local gun shop, however I have heard bad things about getting shotguns drilled & tapped from reading around on various forums. Has anyone here had any experience with doing this to their Nova and do you think its a good/bad idea? Any input is appreciated. Thanks.