I had to pay quite a bit to have this delivered since I live in the UK, but it was worth it. I saw results almost immediately, in that the texture of my skin was way smoother and softer, and any blemishes or marks seemed far less noticeable. The only drawback was that my skin had gone a bit pink, a bit like a light sunburn (and I hadn't been in the sun at all). This seems to be an ongoing problem with this product when it's applied in addition to BP - and it stings a little at first, which is to be expected, since it does after all contain glycolic acid. In fact, I feel that it is somewhat deceptively packaged, since this really isn't simply an 'enhanced lotion' which happens to contain AHA, but more of a 'treatment', and ought to be used as such rather than as you might use a lotion or moisturiser. Having gone a bit pink with just a small amount of this, I can't imagine the disaster which might happen if you were to load this onto your face like a moisturiser. But none of that cancels out the good things about this product - I'll take a little bit of redness over dry, bumpy skin and zits any day! Also, I'm sure it's not the product's fault so much as it is simply a matter of finding just the right way to use it. And you really only need a little, because a small amount goes a long way. One time, I applied this when I had a few new spots, had a short nap, and when I woke up they were virtually GONE. I couldn't believe it! I had been stressing about it, because I can't stand it when I spend weeks diligently applying BP and then slip up and get a little breakout. This makes me feel as if all that hard work has been undone, since it will take ages for the red marks to fade afterwards. Well, the AHA combats that. If I get a new zit now I just put this on and feel confident it will be gone in a day or less, leaving no mark. I'm giving it four stars, because of the redness it leaves, but other than that it's a fantastic product.