Shortly to my beard: I'm wearing a typical 3-day beard. Usually cut to 2-4 days to have always a uniform and clean cut. After applying to the ER-GB40 whiskers are, however, unevenly cut and you have to go several times and in different positions on the beard hair to catch all hairs. I was not used to from my previous device. Even when I went over my beard a few times, it does not look uniformly and maintained.
Unfortunately, the device complies with the simple requirements I have not rudimentary.
From my side I can not recommend buying.