I'm currently running this steampunk(ish) campaign. This is by far the most well thought out adventure path I've ever DM'd. I can't recommend this AP enough. This isn't just your typical hack n slash, dungeon crawl with random NPCs. Everything has a purpose. Every fight has a purpose. Get it. Now.

This adventure path sounds very interesting. It gives an outline of the Grand Conspiracy and the Adventure Path itself. Pick this up for free and it will definitely interest you in paying for the Adventures as they come out.