O.K. A lot of us got it yesterday. I'm liking the new maps for the most part. I'm also really enjoying playing on the two old ones. It's nice to have the new guns and killstreak on the older maps. Salvage is a cool map for fast paced games. Storm is good for just about anything. Bailout is an all around good map. Just watch the middle, it's already a nube tube zone.
It was worth it for me to buy the new maps, but I still can't see putting them on both xboxs. Not to mention my son's xbox is the arcade version, so i'd have to buy a hard drive for it also.