I've seen Conqueror of Shambala. It's okay for what it is, but as a FMA movie it's pointless. I actually prefer the way the anime ended on its own, keeping it ambiguous and pretending the movie doesn't exist. Mostly it's an original story that isn't very good and has next to nothing to do with FMA, and most of the best characters from the series barely register as cameos. It doesn't really add anything to the series so I just ignore it, and wouldn't recommend it to people.