Well so far, everything that I have bought I am glad that I have bought...because I am extremely selective. For awhile, it was Teal pigment, because it is a little too dark for me, but now that I'm starting to mix shadows I'm getting some use out of it.
And if I get anything that I find that I'm starting to wish I hadn't bought, I really take the time to work with it, see what else I have in my makeup collection that might go with it, and if necessary buy some new things...works every time.