I am new to the Biologique Recherche line. The P50 is just as I have read - mysterious in how effective it is and how immediate the results are. My skin is smooth, and glowing; a very different result from what I get from my other exfoliants, both chemical and manual. I bought the small size to try out and after a week ordered the largest - I know this will be a staple of my skincare routine for the long term. Lovely packaging and customer service from Aida Bicaj; I will continue ordering though this site. An all around great experience.