As a Fable II fan you"ll get a solid few hours from the new island, more if you hunt around for treasure and try to get all the new achievements, and it looks very pretty (the snowy scene greeting you on your arrival really is quite stunning and the drastically different looking sun-drenched version looks pretty great too), but you won"t be alone in wanting more.
After Fable II left many players emotionally attached to the characters they"d met, simply playing new quests with your dog might be enough of a reason to hand over the 800 Microsoft Points, but for such a great game Knothole Island feels a bit too workmanlike. Knothole Island is a good effort but far from the standard the full game set.