i never know this product is so popular. I have used YSL, Chanel, Glycel and of coz Avene's hydration masks in the past; of which, I think YSL's performance is the worst; in terms of worthiness and value, i think Avene's should come first- cheap in value, quick absorption, soothing and rich in H20. Chanel's is good to start with, it soften and smoothen your skin in the beginning but the effect is less obvious after a few times and slow absorption; Glycel's is much or less similar to Avene's but considering