I have the shade NW20 to cover my dark circles (I am very yellow based, NC20-NC25), i find with Mac concealers I prefer going warmer to counteract my darkness. As with most Mac products, great shade range however this can be pricey, but you really shouldn't be using much so the tube will also quite a while.
This concealer is okay, it provides light coverage that I really don't find does much on its own. In order for it to cover my dark circles enough on its own, I need about 3 layers of this product. Very easy to layer though, just takes time that I don't have in the mornings. I generally use this to make my Nars creamy concealer a little thinner and find it covers better. You really do only need a little bit though, so the tube should last.
Setting with my laura mercer concealer, I get about 5 hours with this. It does seem to settle into my fine lines even upon application. Definite caution that this can look cakey and accentuate dryness, especially as it wears.
The packaging is definitely a bonus because the tube is very sanitary. My only issues are that it can be difficult to get only as much product out as you need without getting concealer everywhere. It can also be very difficult to get the last little bit of concealer out.
Generally if you don't have much to cover this may work for you, but for the price I don't want to have to be layering products. Would not repurchase