Wow -- I am impressed!
I have been using this serum for a few days and I am very happy with it.  It is very light and absorbs almost instantly - not greasy or heavy at all and there is virtually no waiting time for the product to dry or sink in so that you can get on with your routine.  There is a light pleasant scent but you have to really try to smell it and even that disappears rapidly.  I will continue to use this daily because it is quick and easy and I have already seen a reduction in redness and an over all improvement in the texture of my skin.  I have pretty sensitive skin too, and for me there was no tingling or stinging at all.
Rating: 4 stars