The one thing I'm having difficulty with, and I that I expect some resistance from (from my players) is how I'm handling the Great Curse.
See, the way I see the Great Curse, is that it takes a negative aspect of a person's normal personality, and amplifies it. Each Virtue Flaw is a facet of the character's personality, and is as important to defining the character as their Motivation (or Nature) is.
A character with Berserker Rage is normally an angry, violent sort. A character with Foolhardy Courage is prone to jumping the gun and leaping into conflicts. A character with Ascetic Drive tends to own only what they carry, and shun material things.
I want the players to play up these aspects of their characters, and I want to see a Limit Break (or Virtue) roll at least once a session from someone, and hopefully more than once from multiple players. I want to see a full-blown Break at least twice per Story.
When a character Breaks, their normal (negative) personality trait comes out full-blown and dominates the character's personality completely.
This is why the Solars are so scary -- they do not have control over their darker natures. I want this emphasized in my campaign.