Initial concealer and foundation reaction: love.
I've only worn it one day, so it's a bit too early to know for sure, but so far this combo is wonderful! My skin can be such a bitch, and usually at the three hour mark foundations will start to get gross and slimy, no matter what I do. This didn't! To be honest, my skin started getting shiny around the four hour mark, but it looked like a natural dewiness, and it didn't look like it was the foundation misbehaving.
I used my fingers to apply both products and with the foundation I just used one pump. It covers surprisingly well (and I have quite a bit of finnicky acne scarring).
I know there's been a lot said about the pump on the concealer, but I don't see what the big deal is. Just be careful and it should cooperate.
And finally, as far as colors go, I bought the NC15 foundation and NW15 concealer. They're both lovely (and on my skin not all that different). The NC15 is pinker then I expected, and the NW15 is a lot less pinker then I expected, which is great for me because I have pretty neutral skin. Although, if they had the foundation in NW15 I probably would've preferred it. For reference: I'm N3 in Studio Fix powder (perfecto!), NC15 in Studio Sculpt Foundation(still a bit too dark), 110 in MUFE HD (which is too pink), and Siberia in Nars Sheer Glow (which tends to be too yellow).