I use this oil serum after my moisturizer (I believe that is supposed to be the correct order).  Anyways, it feels very luxurious and moisturizing with no negative results to my face.  Even though it's an oil, it doesn't feel oily, is pretty lightweight and absorbs well into the skin.  I bought it because I was curious about a serum that has truffle oil in it.  Well I've satisfied my curiosity.  I've got combination skin not dry skin so frankly I'm not so sure that I really need this oil serum added to my beauty regimen because I already am using other serums and essences.  It's also a bit expensive so get it if it's only on sale.  Will have to use it for a longer period before deciding whether to repurchase.