We played a whole bunch of Underworlds today in Ichinomiya in a community centre room that had tatami floors, low tables and a surprising amount of "playing in a ryokan" energy.
I actually liked Rivals format quite a lot, having played with it most of the day. Wouldn't switch to it permanently but it's fun figuring out how to score your faction's weirdo objectives that you wouldn't normally take, and it definitely puts the breaks on the sort of roflstomps you can get with tuned vs more naive decks.
The new Stormcast were my team all day and they're...alright. I actually did pretty well with them but that was partly luck (Kawamura-san's dice are...infernal) and partly taking advantage of 3 player games to score their harder objectives. Their inspired sides are actually really good but they need someone important to die for that to happen

. I liked messing with the bird too but keeping it close to the action made it a tempting target, and it doesn't give you anything when it dies and you need warm bodies to score a lot of their objectives. They fall apart pretty quick to dedicated aggression and unsurprisingly my two losses for the day were when Dave took the time to apply some of that
I had a lot of cards keying off the Vulnerable status (1 wound from death) and they can make for great comebacks but just aren't reliable enough at 4 wounds. Would work better for 5 wounds Orruks or Death that can bring someone back on 1.
I liked the cover/gloom stuff and the lack of placed lethal hexes in that it reduces the lethality of the game a bit while the new flipping mechanic for objectives slows down objective holding decks just enough that it's probably fair.
I mulliganed every single game but that's probably to be expected in Rivals. It certainly made late game objectives much more viable.
Overall I think runaway victories are a bit harder and that along with the rest of the changes, is all to the good for casual play. I dunno how it will go competively but in practice that's not *really* my problem so happy with Season 5 so far.