The detachable brush allows rapid and thorough cleaning. The advantage of this brush is that it removes the dead skin from the first use and softens skin texture.
It is used in the shower and her time of 20 seconds is sufficient for complete cleaning of the face. It does not dry the skin (I use it with Aleppo soap) does not make it responsive and prepares it for care - my day cream spreads and penetrates more easily.
I did not see the interest of both speeds, the lowest rate being more than sufficient for my dry skin and brittle.
The purchase price seems very correct for this device, especially as the batteries are included.
It is recommended in the instructions to change the tip every 4 months, remaining within a reasonable budget.