Downside is Catan is fucking boring. It’s one of those games where most of the time you’re stuck waiting for your next turn. 5-6 player add on just makes the game infinitely worse. Out of the expansions, Seafarers is nice since it gives you more to do, tho the standalone Starfarers is my go to pick if I gotta play Catan since it sorta has the best parts of all expansions plus random encounters and a more even start. I also like that in the 5-6 player mode 2 players take their turns simultaneously. Tho Catan still isn’t my go-to of board games.