I had a hard time picking a shade for this, but decided on Fair (860). The shade is a little bit too pink and cool toned for me, but it isn't a huge deal because the colour is pretty sheer anyways. There is another shade that looks like it could be a better match for me, and I might buy that in the future.
I don't like that this is called a concealer, because it isn't meant for that. On the L'Oreal website it says the product is for illuminating and highlighting! This is pretty sheer with minimal coverage, and full of shimmer, so it obviously isn't going to hide flaws or like a concealer.
The product is easy to blend and doesn't get cakey as long as you don't use too much. I have to set it with powder if I use it around my eyes, but that's normal for me. The first few times I used the pen, it took a lot of clicks to get any product out. It also doesn't really disperse itself well throughout the little brush tip, but it works better now that I've used it more.
It seems a bit expensive for a small amount of product, but it isn't something you use too much of at once anyways so it lasts a good while.
I would definitely recommend this, but I think the Concealer part should be dropped from the name! Otherwise it is a decent little product.