Paint mixing cups are a silly thing to get excited about, but these things are great. They're cheap, but they're sturdy enough to be cleaned and reused many times. I've had a stack of these for quite a while, and I don't think I've thrown any out yet. I especially like the handy pour spout, as well as how the whatever-they're-called things that keep them from stacking too tightly are on the outside so they don't interfere with mixing and cleaning. Seriously, just buy them. Better yet, buy a bunch.