A lot of people diss on pistol grip only shotguns for a variety of reasons and they're not very suitable for home defense. Having said that, I have a fair number of them simply for the "fun factor". However, the chainsaw gimmick never appealed to me at all.
Have you ever shot one of these yet? If no, I'm willing to bet once you buy one you'll no doubt try a standard forend at some point. The Hogue Tamer forend with a birdshead grip is a great set up. The Hogue Tamer grip is good as well.