I'm running a Sword and Sorcery version of Kingmaker using Iron Heroes. So far, it's cool, we like the whole idea of making magic a rare thing, a force which corrupts and which humans should not meddle with. Bear in mind that Iron Heroes has TONS of options so it sometimes is a bit mind boggling and requires a lot of time investment to learn all the skills/feats/new rules for both players and DM. We just skim over them and go with the flow (players are OK with not min-maxing the best possible build, as long as the character "makes sense" in-game and is not obviously useless rules wise).