I have only been using this on my face for 3 weeks. During the first few days I can't say I noticed a difference right away, but it feels good on the skin, it's absorbed quickly though I feel a little tingling on the face just like when you put on a strong astringent, but it goes away after a while.
I can say my skin has improvement using this, it feels soft to touch, and I am not seeing any dryness at all.
I am just not sure how to use this together with the vichy cream, and it's supposed to be a routine so I used this in the morning and the cream at night.
Price-wise, it is quite expensive but if you want the real thing it's not a bad decision to purchase this. Personally, I would wait on sale or coupons before I purchase.
I received this product for free to test and review, anything I wrote here is honest and my own.

I love this product. It is exremely light weight and soothing. My skin was glowing and felt velvety-soft. The packaging is exceptionally attractive. The scent is nice and not too over-powering.

I really liked Vichy... All the products I got to use everyday... Are really very good... The hydration power serum did make difference on my skin... Definitely my skin felt hydrated after applying it all day long... Definitely recommend to buy it :)

This product worked quite well for me in combination with the Hydrating Moisturizer. I found it gave me a nice smooth surface to go ahead and apply my makeup or to just go about my regular day. It dod make my face and skin feel alot more moisturized while using it.

Loved this product!

This is honestly the best serum I've ever used. It soaks right into the skin. Doesn't leave me oily and keeps my hydrated all day. My skin has never been so soft. I've never used a more hydrating serum. I will continue to use this. With the hot dry weather it's a definite must.

i received this from chick advisor to sample #gotitfree and this serum is light weight and sinks in the skin beautifully adding that extra bit of moisture to your skin this is an a1 product and must have in the colder months

I am very impressed with this product! It hydrates my skin so well, and soaks in so quickly. It does not leave any greasy or oiliness and feels so silk on my skin. My face feels moisturized and smooth all day long. My only issue with this product is the price. I didn't find it was quite amazing enough to spend so much money on.

Note: I #gotitfree to try out in exchange for an honest review.

This serum is great. It is lightweight and like the other products in this line, it applies easily and is quick to absorb. It leaves my skin feeling hydrated and refreshed. The smell is not bad either.

love the scent and the silky feel of the serum on my skin. Its hydrating enough that I am able to use the serum in place of a moisturizer! Although I'm not sure if I use both products if im supposed to apply the serum first and then the moisturizer or vice versa.

I received this product for free in exchange for an honest review.
Of the Aqualia Thermal products I have tried, I have to say that this one is my favourite. It's the most suitable for my combo skin which tends to be oilier in the summer (now). Like most serums, it's light and watery, so it absorbs quickly while providing hydration for my skin. I noticed a visible difference after using this product.
The packaging of the product is also great. The product comes in a nice glass pump bottle which provides great control for dispensing the right amount of product for you to use.