I've tried this product for 8 weeks. Fortunately I have a full head of hair so trying out some products to see if it makes the hair feel thicker. For the first 2 to 3 weeks I didn't like it but decided to keep using it to empty out the bottle. 8 weeks and still have some left in the container the hair seems to be better now. Just purchased the conditioner version as a combo. I think the shampoo works better when conditioner is also used. Being a male I normally use conditioner about once every 5 years, but will start using both.
The conditioner works well to smooth out my hair, but since I only shampoo and condition my hair 2-3 times per week, I haven't noticed a long lasting change after using this product. If I blow dry my hair after washing I notice that it feels slightly thicker in a pony tail, but for the cost, I'm not sure it is worth it for me