I bought this on disk instead of nights of nine as the disk has both. Good but inights of nine does nothing unless your willing to do a borig intro quest (in which u have to find and paray al all shrines of the nine)

If you were a fan of oblivion, you are not going to be disappointed with the expansion, an entire new realm with crazy-insane NPC's inside it, all new armor and weapons, spells and even a pet at one point, the storyline is very good and enjoyable, you don't need xbox live since I downloaded the patch when I was offline, definately worth getting!
10/10

This game comes with Nights Of The nine aswel as Shivering Isles and is well worth your investment but only aslong as you are online active.
I dont know why you have to be online but its something to do with Microsoft,not Bethesda.Probably a design choice to try and get more people online.
Overall though i think its better still to buy this package than download online as atleast this way if you need space on your system you can delete the pack and then re-install whenever you like or even sell it on.Downloading means your left with it forever unless you delete it.
Great addition to an already amazing game - you can never have too much Oblivion!