I don't like John Frieda's shampoo and conditioner very much since I find that the shampoo feels like plastic, and the conditioner is full of slippery silicones. That being said, I've heard amazing things about some of their other products, such as the iconic Frizz-Ease line.
This lightening spray is pretty much a heat protectant, mixed with a touch of bleach and some citrus and chamomile extracts. The product is not suitable for medium brown, or dark coloured hair since it would turn rather orange. You can see the full product details on the John Frieda site here.
The results are exactly what I was looking for - noticeable highlights, without looking fake or overdone. For a drugstore product thats around $10, I couldn't be more pleased.