I like this serum, and notice a definate difference in the skin on top of my hands, which was starting to look crepey.  I've tried it on top of moisturizer and on it's own.  For me - it's too much in the hot humid climate I live in to have both a sunscreen moisturizer on and this product during the day.  Although I used the serum sparingly, it still felt sticky and tacky and I had to wash it off after an hour or so.  However, I do use it at night over my moisturizer with no problems. I do notice that the fine lines on neck and mouth are softened.  As I said, I also use it on the thin skin on my hands and have noticed a big difference, much more than using the hand cream alone. There is no odor to this product that I can detect.