Without going into all the nitty-gritty details (which I don't remember off the top of my head anyway) I can tell you that there has been many AFIS aerodromes for several decades in Norway. They function very well. The majority are in the more "remote" areas, and traffic normally consists of scheduled flights with Dash-8's. Some of the IFR approaches have been quite "amusing", with LLZ offset 70 deg's etc, surrounded by mountains thousands of feet above you. But they work, and get the job done. Safely.
