Been liking it, been playing out in Gaul as a sort of Noobie Island, so I haven't gotten too far. Levies feel simple which is nice because there is a lot of complexity to the combat system I haven't even dug into yet. The detailed provinces and pops are great, love the building systems, the importance of cities and different pop types. But the real upgrade is the UI and CK3's nested tool tip system. Some of the information can still be a little hard to find but that might just take a little getting used to and a few buttons or interactions with the UI seem a bit touchy but its not a big deal. The new UI and the nested tooltips finally allow for great enough easy of access to enough information to play the game. Barely got to the tech tree at all, but I really like it, having some techs be highlighted as more important, it helps guide you to rush toward particular high end rewards.