Both DLC packages ought to be free to those who've already purchased Assassin's Creed 2. These weren't true add-ons, but rather sequences which couldn't be completed on-time for their scheduled release date. 320 points, or any points for that matter ain't a deal at all. These two sequences add up to around 1.7 GB, which should have been on the retail disc.
Ubisoft should just pony up. The platinum edition, gold edition, goty edition, or whatever later on will contain it all anyway [cough*PCs win*cough]. Early adopters screwed again.
On the flip side, Ubisoft did get the Uplay points system correct by rewarding players for in-game achievements, rather than just a 'score' such as Microsoft's gamerscore system.
You win some, you lose some.