I have been using this relegiously for 2-3 years now. OK, this will not be for everyone: if you have dry and/or sensitive skin or need it to have it washed off then maybe give it a miss. Otherwise read on...
It is a plasticy thick serum texture, probably lots of silicicones and alcohol, with noticable but tolerable smell. It applies well and dries off quickly leaving a mate look and no residue, my skin seems to be able to absorb a good quantity.
I use it in 2 ways. Almost every day i will mix some of this with my moisturiser. It can be even mixed with some foundation. It combines well with other creams/products and gives a tightening kick which i can feel and see. No rinsing off.
Other times I use on its own but make sure there isnt too much residue because it might flake when dried. Again no rinsing as it is completely absorbed and leaves no residue. Used in the second way skin will look very mate and might seem to lack shine and radience but thats not a problem for me. Again once totally dried you migh be able to use some light product on top to add shine if you want.
Its dirt cheap, i recomend experimenting with it, you might get hooked too.