Update: The seller offered me a refund. I'm hoping this was just a bad batch. I really like the results when it prints, so I'm going to wait a while and try buying again. Another important thing for everyone out there is to be sure to fully dry every filament before printing. Not drying evidently can make the filament brittle as well as cause extrusion problems and stringing. Some filaments come surprisingly humid out of the bag.
This seems to be really poor quality stuff. I can't tell if it's inconsistent diameter or if it's slippery or what. But it does not perform well in the Bambu AMS. Ever time the printer would go to load or unload this filament, it would get stuck. I tried every slot, and I tried other filaments in all the slots. All the other filaments I tried worked fine. But this ZIRO one consistently had problems, both for loading and unloading.