I've had the opportunity to put this palette to the test several times now on different faces. For concealing sunspots, acne scars, and other mild discolorations, this concealer is fine. This product did not conceal moderate to severe discoloration even when I used color corrector underneath. For reference, I've used this concealer with RCMA foundation and MUFE HD foundation.
Pros about this palette:
Wide range of concealer types
Each concealer is labeled for you
Good value for the amount of product
Does not conceal moderate to severe discoloration, which most faces have in some form. So, it is not a product I can rely on for every job.
Advice: Go for a full coverage concealer (there is no other acceptable kind) - spend a little more even if there are fewer shades in the palette - you can mix them.