My skin is super picky. But I have had nothing but great results with all of The Ordinary's products. They're both unbelievably affordable and unbelievably effective. I could see a noticeable difference in my skin's texture and overall tone within two weeks of using this product. I use 3-4 drops twice a day after cleansing and then follow up with either more water-based serums or moisturizer. It's now a staple in my routine!
I didn't dislike anything about this product.
The only tip I have (and this goes for any hyaluronic acid product): make sure you wet your face before you apply it, otherwise it'll suck the moisture right out of your face to work it's magic. Also, if you do feel any tightness after, follow up with up with a good moisturizer.