Changed to a more natural, organic based dye a couple of years ago. This one was 1st choice and I never changed since. Its a beautiful colour that shimmers with golden tones in light. Also no sting/overpower of chemicals. Chamomile is clearly noted whiff which hasn't always appealed to me but it may be personal.
I only use it on my roots now and leave it on longer than instructed, which never caused any harm. I felt the recommended time wasn't quite enough for developing or full coverage.