Much better than the classic color shampoos that cause skin irritation (redness) and an intense, unnatural color. For someone who has gray hairs and wants to darken them, there is nothing better. ATTENTION to the timing, 10 minutes for white areas/gray beards is enough for a mild, natural result. More than 10 minutes darkens it quite a bit and it may look unnatural compared with the other gray areas of the face. Of course, this depends on each person's hair. I recommend starting with 5 minutes and then rinsing, and repeating where needed with particular attention to the application time.

It is the only dye that does not cause me itching. The downside compared to other dyes is that it needs 15-20 minutes instead of 5. I would also like it to be available in other colors as I can only find it in black

One of the few, if not the only one, that does not burn the skin or create small ulcers on it.

Weak compared to other products I have used, not even close to the 5 to 10 minutes mentioned in the instructions for the time you should leave the product on your beard. I leave it for about 20 minutes to achieve the same result I had with another dye in 7-8 minutes at most, and still it's not the same.
On the positive side, it doesn't cause a slight burning sensation on the skin like other dyes. But I understand that this results in it not being effective at all.