I received a small bottle of John Frieda Sheer Blonde Controlled Lightening Spray for free off of their facebook page. My mother got one too but since she has black hair she gave it to me.
The package says after 10 uses there will be a noticeable difference and it works best on blonde hair. I was really impressed with this stuff! I definitely notice a difference, particularly on the bottom half of my hair since it is lightest. I haven't died my hair in over a year so the top half is darker because of my roots growing out. I have started using it only on the tops of my hair to lighten it up a bit more. I'm planning on dying my hair pink and this is great alternative to bleaching.
I would definitely consider buying this stuff full size. I would recommend it to anyone who wants to easily lighten their hair a shade or two. This stuff is awesome!