I bought my kids four masks like this for Christmas, and they totally rock. I'm so tired of the "princess" and "fairy" dress-up stuff my girls have received, and I wanted to give them a creative dress-up alternative. I saw this cool animal costume line at Hammacher Schlemmer, but at $30 a pop, I wasn't willing to make the investment:
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I ended up finding this cow mask and others on Amazon, and for $5 each thought they were worth a try. One thing that's not clear from the description is that you can press on the nose to hear the noise the animal makes! We bought a wolf, a mouse, a cow and a dog. My girls absolutely love them, and they encourage creative play rather than the typical princess nonsense. I feel like they were the biggest "win" this Christmas.

The only sad thing is there doesn't appear to be a way to replace the battery once it dies. Otherwise, I'm thrilled with my purchase.