Your Faces album won't sync across your computers — but there's another way to see that collection across your devices.
I like being able to see images of certain family members at a glance — it's helpful for building birthday cards, for instance, or finding great blackmail photos — and it's why I've always loved the Faces feature.
But with Photos for OS X, your tagged Faces won't sync between your Macs — they live, siloed, on the machine where you first tagged them.
This is silly, and something I hope Apple fixes in the next Photos for OS X update. Until they does so, however, you're not completely out of organizational luck: There's a sneaky work-around to get those tagged photos to sync to your other computers.