I read the instructions, bought a glove to prevent burns so I could use both hands, & used M-F only. I have long, straight, fine hair.
Pros: It did give the "appearance" of volumn & I could create multiple styles in a short period of time. Cons: You cannot get to the roots without burning the scalp. The unpleasant smell is the subtle damage occuring from the high heat. After 2 months I noticed I had developed a LOT of short fly away hairs next to the scalp & I was losing approximately 1 1/2 inches in length each month due to newly-developed split ends.
Bottom line: Product does give the appearance of shine and volumn usually associated with "healthy" hair - in the beginning, but the ultimate result is irrepairable damage and rapid loss of length.
My advice: Save your money. A good styling gel with a blow dryer & brush routine and a quality leave-in conditioner will give you better results without the damage or expense.