Here's the caution: Ubisoft have a new DRM scheme whereby you can only play their games while you're actively connected to the internet. If your connection goes down, the game crashes. You may lose your save files, you will lose all progress you made since the last save.
A lot of us have decided not to buy any Ubisoft games until they recant from that madness. If I buy a game, I want to be able to play it anywhere, anywhen, anyhow. There has already been trouble with Ubisoft's DRM servers being offline for 3 days (as far as I know) in one instance.
Buyer beware.