I have an upland special in 12 gauge and it was my #1 for a number of years - especially for field hunting geese. Sitting up from a row of barley, found it mounted fast and I liked it far better than my longer barreled shotguns.
The straight stock is ok, but if you are tall (I am 6' 4") you have to watch you dont punch yourself in the nose as it is shorter than most. It is light and easy to carry, and does come up fast. I also have a slug barrel for it as well.
That being said, you need to practice with it! I tried duck hunting with it this fall after not shooting it for a couple of years and did horrible - with that short barrel, you need to focus on keeping it moving or you will shoot behind your target on crossing shots. In the last couple of years, I have been using my Benelli Nova - but needed a short firearm to fit in my baggage for this years hunt.