There are very few choices in korean products when it comes to AHAs, and cosrx will benefit from that being one of the few brands that have a specific AHA product for exfoliating purposes! It's definitely functional and works well as an exfoliator, the only thing to be wary of is that it does indeed smell really bad (though most AHAs don't smell great, but even compared to other AHAs, cosrx does feel extra smelly). So if smells are really important to you, then I wouldn't recommend this product.