Anyone ever play Horus Heresy ?

As the title says, anyone ever play this game.?

Rokassan and I have attempted to play once, but ran out of time and haven't really tried since. Is it worth learning all the rules and doing the extensive set up ?

I enjoyed it, especially because of a diceless combat system that gives you more control of how a battle goes. It's really a focused wargame. The size of it of course as with all FFG games is a pain in the ass for set up and clean up. The scenarios pretty much just give the game different starting conditions, and the random factors at the start of most games help keep things somewhat fresh.