It really depends on your skintone (and undertone) and how much you want your blush to pop. I am black (wear NC44ish in MAC). Not every shade will work on everyone. I can personally only wear 3 out of the 4 shades. The shades are buildable. They work as a stain; therefore, they will last a bit longer than normal blushes.
Now whether it's worth the cost depends on your budget and what you're used to buying. I personally have bought more expensive blushes, and I love all of my blushes equally. It is a small container, but I literally use two tiny drops per cheek. This will last me forever lol.