Great:
1.  Price
2.  Enough curls to work with.
3.  Fits various head sizes.
4.  Durable (doesn't lose strands like some cheap wigs).
5.  Easy to clean with damp cloth.
6.  Best suited for stage-distance or costume party where realism is not needed.

Improvements:
1.  Comes flattened, hard to shape like the picture.
2.  Does not hold it's shape well.
3.  Not suitable for up-close viewing or many repeated uses (of course, at this price).