I too have naturally blond hair that I dyed dark brown/auburn last fall and let me tell you ...I've had it dyed about once a month since then and it's not just because of roots (which I don't think are as noticible as brunettes who dye their hair blond) it's because my hair won't hold the dye! It fades out in a week! It's the worst. I have decided to stop dying it and just live through my hair looking awful and faded until it grows out. I will say one thing about having dark hair - my blue eyes really stand out. That's about it.