I planned to buy a shorty few months back. Dominion 8.5", 12.5" and Outlaw fell into the basket, so I did some research and actually went visit the gun shop which carried all of them to have a hand on.
Result was, I didn't feel a big different for a 8.5" and a 12.5" for handling and pointing, but you should understand the 4" different might have some advantage on accuracy, and so, shells capacity. And so the price different also make the 12.5" a better choice for me...
And the Outlaw...It was "rough"...what can I say! Actually the overall finishing was fine. Dark bluing, dark wood, tight action, but comfortable tight. So why I still said it was rough? Because there was a scratch on one of the barrel partially covered by the wood, and the size was about 1x2" exposed, and the low paid labour just blued the barrel as is...I noticed that, and so as the the shop owner (actually every one handled it should have seen it! LOL) and it was the reason why he listed the Outlaw much cheaper than other venders.
Finally I chose the 12.5" for its handling and versatility. I also like the Outlaw, for the cool factor most, but the weight is just too much for a little gun like it. So if you are looking for a backpacker shotgun, I would wait for the next batch of the single barrel Backpacker from CanAm. I wouldn't suggest the Outlaw as a first shotgun purchase, but sure worth the money to have it including in your collection.