Played with these for the first time last night and oh my word - I'm in love.
Game was Aeldari vs Grey Knights and it was the swingiest thing ever! It felt how
40k (in my opinion) should feel.
For anybody who doesn;t know about these cards, see below
The secondary objectives made the game unpredictable. There was no getting to turn 3 and being able to predict the outcome of the game because you didn't know what secondaries you would pull from the deck, and of course they change every turn as they're completed / discarded.
Likewise, you couldn't build a list specifically to score secondaries, and army specific secondaries that you basically score just for turning up are out of the game entirely.
You can't put all your chips on stopping your opponent from scoring an objective because they have the option of discarding it at the start of their own turn and simply picking a new one.
No doubt, this may not be up everybody's street - i expect the competitive gamers among the hobby will be less keen, but for casual friendly games it was incredibly refreshing.
Keen to hear other people's experiences with them!