Finished up AC: Revelations last night with 100% synch.
I was surprised that pretty much the entire map was available from the start. Normally, first I do what ever viewpoints are available to get a layout of the map. As I kept getting to them, I realized I pretty much had the entire map after just doing the first sequence. I then went to get pretty all the collectibles. At some point, without realizing it, I did something that upgraded my armor to the Master Assassin's outfit. So my health went from what you start with to being fully maxed.
Overall, I liked the story. Looking forward to the next one, AC: III.