Played the demo three times now with Poland.
Every time, Duchy of Silesia has rebelled and declared war not too long after I changed the law allowing me to revoke titles.
Whenever I went for a pagan bashing up north, every neigbouring pagan would subsequently declare war on me.
My first game got stuck when my leige's lover fell pregnant (known bug).
The second game lasted the whole 20 years, I slowly built up Krakow's fortifications, inherited Mazovia and Plonsk. Duchy of Greater Poland did a Ducal War, gaining that one province to the north I can't recall. Beheaded the Duke of Silesia after jailing him and putting him in the obloulette (sic).
My last game had the King die in battle against Silesia's forces, and the kingdom was inherited by his daughter (married to princess of Denmark) at age 2. It was cool seeing the regents change every once in a while - couldn't dismiss my regents either!
Still inherited Mazovia. Went pagan bashing against Danzig and subsequently was drawn into war with Mecklenburg, Lettigallians, Lithuania - thankfully my 20 years was up. During that time I also saved 800 bucks and built the new Barony of Warsawa in my Krakow province.