Chiang's stories walk a thin line between fiction and thought experiment. As prompters for speculation about free will, consciousness, the multiverse etc. they're excellent. I especially liked the title story, set in a pneumatically-powered universe where the equalization of air pressure is a metaphor for entropy in ours, and featuring an extended scene of self-conducted brain dissection. What this story has in common with Chiang's best is that it sticks the emotional landing: The Merchant and the Alchemist's Gate, a time-traveling Arabian Nights-style frame story does this too, and is impossibly clever to boot.
I was less taken with the Hugo-winning novella The Lifecycle of Software Objects, which relates the ups and downs of a group of (mostly) VR-dwelling self-learning AI's, designed and marketed as virtual pets, and their human owners . Unfortunately the "digients" never get past toddler-speak, so the dialogue is somewhat infuriating, although it has its moments, like when they get upset because their owners won't legally incorporate them:

I personally thought the first story was the strongest one, even though it has cliche themes and patterns I recognize from other stories I read in the past. I think it had a good mix of style and atmosphere that surrounded the characters and setting that felt more animated than the others. I also found The Lifecycle of Software Objects pretty mediocre. Sure the topics tackled and zingers were nice, but the whole extended "baby/child talk" got old quick. Even if they became more intelligent as time went on, I felt like dialogue was limited because of this constraint. Also just felt like a Black Mirror episode in a story rather than much more than that.
Yeah I agree that the Arabian setting really made the first one stand out from the rest, which are mostly populated by well-heeled knowledge-industry types with drawers full of identical folded clothes. With you on the Black Mirror analogy too - I've only seen a few but it seems to be another case of the story struggling to keep pace with the ideas.