Review (4/5): does what it says!
I am allergic to hair dye so I had to purchase Henna. It does dye my hair great but my old Blonde highlights are coming through and it's only been a month. But since it doesn't harm hair, its still worth it for me to dye once a month.
The biggest negative is the smell. It smells like cigarettes and you aren't supposed to wash it for 24 hrs.