Haven't done an IV yet (doing one later this year), but I think this will be my biggest issue. I like having the curtains closed to keep the room dark until everyone in the room is awake. But before everyone is awake, I like being able to peek out through the curtains in the morning like to check the weather, or whether we are docked, without letting in a ton of daylight. From what I understand about the IV, that won't be possible.