I've also heard good reviews but I will just stick to my 835. One of the original purposes of coming out with a 3 1/2 in. 12 Ga. was because of being limited in 10 Ga.'s to shooting 3 1/2 in. shells. They came out with the 12 so waterfoulers could take their duck gun to the skeet range. If I can't shoot 2 3/4 shells in mine I would just assume go back to the 10 Ga.
Just my opinion though. If you are looking for an auto that only shoots 3" and 3 1/2" then I'm sure the Mossberg is a good shoutgun.