I love these concealer! They are very high quality and the shade range is amazing.
I use a lighter shade (Neutral) to conceal and highlight my under eyes, upper lip, nose and forehead. The darker shades are great for contouring, they blend out like a dream while still being effective at carving out my cheekbones and nose (I use the colour Toast, it's a nice cool toned brown). The yellow corrector is my fave, I use it to brighten up my face, under the eyes, around the mouth and nose. I also like mixing some with my foundations if they look abit dull on my skin or have a pink undertone.
I have this concealer in 5 shades, my mum who is over 60 also loves the coverage of these, they don't settle into lines and give a dry appearance to the under eyes the way a lot of concealers do.