I do like this concealer a lot. I think the trouble people find in covering acne or other skin complaints is that i find it has a 'brightening' quality. In fact, it reminds me a lot of my Nars creamy concealer, except that the finish isn't as powdery (i hate that).
The coverage is pretty good, out of five i'd say 3/4, but definitely better than Mac pro wear concealer which was a total let down in that respect of covering redness!
you can wear this dotted under the eyes down the nose, chin and either side of the nose, and just blend it out instead of wearing foundation for a really beautiful flawless look.
I have this in light and i'm an NC15/20, it works if i use it as a highlighter and am covering a few flaws, but it's just too pale by a smidge, so if i had to choose again i'd buy a beige.
I think this concealer is perfect for night, because of how perfect it makes your skin look, but for day time, i think i prefer something slightly more translucent like YSL touche eclat (yes i know it's not a "concealer", but it works).
The price is pretty steep, but i don't regret buying it, it hasn't broken my skin out at all and is useful for the occasional spot. If you're looking for something to cover really bad acne, you can try this, but i'd opt for something even more cement like the Kevin Aucoin pot which will last you forever.