Has anyone played the Cities of Splendor expansion yet?

I bought it recently and have been playing some games with my dad using it. The expansion comes with four rules variants, and you choose one of those rules variants to play with at any one time.

The variant my dad and I keep going back to, and the one that I feel comes closest to maintaining the spirit of Splendor, is the Cities variants.

The Cities variant simply replaces the Noble tiles with three City tiles. Instead of getting 15 points, the victory condition is to earn one of the City tiles. The City tiles work like Noble tiles in that you get them at the end of a turn where you meet their condition. The conditions to get a City are things like get 12 points / 4 Green / 4 of a kind besides Green, or 12 points / 6 of a kind, or 16 points and one of each colour. I think there are 14 cities in all (7 two-sided tiles)

At its core, this rules variant is still Splendor, but there is an additional planning consideration now because you can't win without getting a city.

There is another rules variant with strongholds, that has you lock/unlock cards on the board every time you buy a card. But like, you really don't need to buy a whole expansion to play with that variant. Just get 12 tokens that you can divide into distinct groups of 3.