by Iron_Salamander
So far I've used the 1st three.
I love the flagships and factory cards. The flagship can be used to grab elements you can't otherwise use at the time and the factory cards are a lot of fun and give you some really neat abilities. I can't see me playing without this expansion now.
The hourglasses are mechanically interesting and put some pressure on, especially if you need the more difficult roll glasses to win still and have to watch them fall to the discard pile when you fail. They also add a lot of rerolls for little risk once you have that stack's glass acquired. Not sure how they stand thematically but they are quite a cool addition as far as function.
I played the 3rd expansion with the hammer birds only once so far. I got all the hourglasses and all the stone clouds smashed but ran out of cards needing to finish 3 air ships yet so was my worst loss to date. I need to play it again to judge it better but I do think it adds an interesting wrinkle that you have to deal with.
Once I beat the 3rd one I'll move on to the 4th and beyond.