*Ease of use- 5 out of 5 stars...seriously, it could not get any easier! *Smell of product- 2 out of 5 stars...very strong odor during application *Cleanliness of product application- 5 out of 5 stars...not at all as messy as most other products *Final color- 5 out of 5 stars...very vibrant and not artificial looking! *Lasting effects- 5 out of 5 stars...I colored my hair almost a little over 2 weeks ago, and it still looks vibrant! *Cost-effectiveness- 5 out of 5 stars...How many other products offer 2 for the price of 1?!