Awful.
I have ash blonde hair naturally which has been lightening. I said what I wanted was to blend the ashy regrowth and wanted it to continue to look natural. They recommended blended foils in the lighter blonde and my natural colour.

What I got was warm browny blonde striped with bleach white. Plus damaged hair because the hairdresser instructed the helper to come out my hair when it was shampooed rather than conditioned because she wanted to 'check' it before conditioning but was too busy cutting someone else's hair.

Be very careful to ask for someone who earned the rewards that they rave about - the person I had sure didn't!!!

Approximate cost: $200