For "running the game": in the playtest i found ambushes kind of clunky to run without a surprise round. I would be interested in a couple of simple examples where 1 character successfully beat the perception dc to sneak up on someone, then decided to attack. Initiative is rolled, attacker using stealth, and other character using perception. If the attacker rolls lower now, is he noticed, or does he just go second? If he is not noticed, is the other character even aware he is in combat? If he is noticed, it feels he has to successfully sneak twice to ambush someone.