Many reviewers have mentioned the color still being quite noticeable months after being dyed. The color doesn't always come out completely, so it may not be a great option for someone looking to get their natural hair color back.
As the colour washes out, it often leaves the hair with remnants of faded colour is almost impossible to wash out completely. It is best to either cut the hair, or colour over it with a darker shade than the staining.
To keep these colours looking their best, it is wise to reapply after 4-5 washes maximum. In Australia, Classic Cream is approximately $25 and Amplified is $30 (Amplified is reported to last 33% longer)