So, this product contains 60ml in each bottle, which is pretty small but you don't need a lot and I have had this a couple of months and I haven't used much. The purpose of this, is that when you finish your makeup application, you spray this, about 1-3 times onto your face and it's supposed to lock in your makeup and keep it from sweating off, smudging and fading away in the middle of the day. For that purpose it does it's job very well, I put it to the 24 hr test and without this on my makeup lasted around 9 hours, which is not bad, but with this product sprayed 3 times all over my face, then it lasted a total of 12 hours on my face which is really good!
However, I did notice that it did leave a dry, red patch on my face so if I'm going to use it then i have to make sure I apply a thick moisturiser before applying my make up and after taking it off. The smell of this product is the same as the brush cleaner as in that I can't out my finger on what it is except that it is a very sharp scent but, unlike the brush cleaner, the scent doesn't linger on your face and it isn't as strong.
I would definitely recommend this product as I absolutely love it.
Hope this helps!