This product is finally clearing some stubborn cystic acne that my other acne products are not working for anymore. It is expensive, but it works!
It did tingle the first time I applied it, but not anymore. I have been using it for 2 weeks and already my acne is starting to clear up. (It will sting on open, raw acne sores or any kind of cut or abrasions)
I use this during the day and a retinol + acne medication at night. I find that I can keep dry flaky skin at bay by placing a good thick moisturiser on top (let the Glycolic acid do it's thing for 20 mins or more before applying something on top)
If this clears my acne and keeps it under control, then I definitely will be purchasing again!

I got this product for free at a NeoStrata training that I had attended and for the most part, I am really enjoying this serum.
The texture is very light, thin and feels very smooth when applying. It does have a bit of a "gel" feel to it though, and it feels very sticky and tacky on my skin and doesn't absorb well or quickly. When I apply my moisturizer over top of it, the stickiness goes away and seems to absorb with the moisturizer - I usually try to ensure my serum is entirely dry before I apply any additional products but this serum just doesn't dry or absorb on it's own.
I saw a difference in my skin after just one use though - my dry and flaky skin around my nose was minimized and my pores also appeared smaller. I have high hopes for what this product will do with long-term use. (I have only been using for a few days now).
Also, I feel no burning or discomfort when I apply this product even though it has a high percentage of Glycolic .. I did have some irritation when using the 10% Glycolic Cream from Neostrata. This product is created to be gentle enough to use daily but if you are sensitive you can apply it every second day until you build a tolerance. The smell is also very medicinal .. I wish it was a bit more of a pleasant scent.
I do recommend this product but I doubt I will end up purchasing this when my current bottle is empty - I found another Glycolic product that I prefer and is a little bit cheaper that I feel gives me the same/better results and also smells better with no sticky residue.