I have very olive skin and found that the medium had a perfect undertone for my complexion.
I did find that for me, the consistency was quiet thick as I do not wear any other makeup.
When using it, I apply it in small dots around my face and rub it in. I find thats the best way to achieve an even, thin layer without looking washed out.
I personally wouldn't buy this product again but I would recommend it to something with oily or combination skin.