During the first use, I was not really reassured (too bad experiences in wanting to cut nose hair protruding and, ultimately, to tear them and feel bad little pain). Until the first cut hair, so I was on the defensive and almost removing this unit urgency of my nostril. And there was the "miracle" :-) The cut was smooth.
It takes a few uses, to fully master the machine and best cutting but I've never had the sensation and the pleasure of the nose also cleared.
For the nose and ears, there really is no problem. I did not try on the eyebrows, but for feet / beard, it is better to have a teen hair (being quadra with thick hair, only a true beard trimmer is effective)