Basic serum at a great price, but
I really like the packaging. Difficult to dose, you need little but too much comes out quickly, and you won't get this back. I don't have sensitive skin but still this serum stings when I use it after (mild) exfoliation.
I wouldn't buy it again for the above reasons, and because I like to use 'loose' instead of Q10, prefer a nice blend with other useful things as well.