I enjoyed reading Factions, which is a quality product, worthy of your time. Having read it, I wish dearly that there were public examples of play available, especially since it is intended for play-by-post. Peter does include examples for one hypothetical player, but I still came away without a clear picture of Factions' intended PvP gameplay.
Nonetheless, I am excited by the ideas in here, and I'm itching to give it a go.