works perfect. Purchased VZW 6 from Apple, but unfortunately, the Apple version automatically activated itself on the account I used to purchase, so that was a mess (fwiw, purchasing from VZW doesn't go through this automatic activation process). After getting all of that straightened out, I swapped in my AT&T SIM from my 5s, and all is working well.
Love having an unlocked 6 for any future carrier swapping I might do 🙂