This hair colour is amazing at covering greys and the colour lasts for weeks. The formula is easy to use and does not take long for the colour to take effect. The smell is not harsh and it does not give off fumes that hurt the eyes. The best part of the system is the conditioner that is included in the pack. It smoothens the hair and does not leave it stringy like most hair colour systems do. Is it a good investment and a quick fix when you don’t have the time or money to go to a salon.