I like my SP-10. A few of the people around here (local hunting buddies) argue that 3.5" magnum 12's are a better choice, I respectfully disagree. Although some 12 gauge barrels are available overbored to almost 10 gauge dimensions the proof is in the pattern. From what I have been able to observe the 10 patterns better. I like to use BB size steel for geese and have had some great mornings in wheat stubble with it. The SP-10 is heavy however, and it is not a lot of fun to carry it around all day, I prefer to use it in the blind or from some stationary place.
Low percieved recoil helps make it a pleasure to shoot, and the weight makes it easier to "follow through" on passing birds.