Review (2/5): Coloring is useless, brush is good
If you're looking at this set for the coloring pen, don't waste your money, the coloring is garbage and not at all durable - it's in no way waterproof or sweatproof, you can lick your finger and rub it off, making it on par with using a washable Crayola marker on your face.
That said, the only reason I gave this any stars was the brush is pretty good for taming unruly shorter beard and mustaches, of medium firmness to do its work without being too harsh on the face.