Yes works fine...might have to reposition your face in the circle sometimes.
Yes it works, but it is best done with lighting that creates NO facial shading and a clean and clear background. Also make sure that the Wi-Fi access is fast, especially when you get to the winking/smiling/head-turning exercises.
My friend was trying to enable his at the bank and after failed attempts at the customer service desk, the bank staff took him over to a better lit corner. Unfortunately, it also had a bank advertising placard in the background that had other people's faces on it, so was even worse. Eventually managed with a clear background.