I have had my fan blade covers for a couple years; I like them and I am going to buy another two sets this summer. They are lightweight, so they don't place an extra burden on the fan motor. They LOOK like real wood and considerably improve the look of a standard ceiling fan. We have 5 ceiling fans in our home, 2 with these covered blades. The 2 fans with covered blades have much better air circulation than the other 3 fans.
I dropped the rating from a 5 to a 4 because I think that they are overpriced - even though they are a nice looking and practical piece of molded plastic, they are still just molded plastic and therefore pricey at $130... But, I am planning on buying another couple of sets of the overpriced blades because I can't find anything comparable for less.

These fan blades were advertised as increasing the air circulation of your ceiling fan as well as updating it. The opposite is true. They diminish the air flow. By quite a bit. I would return them but I already burned the box they came in. They look better than the fan blades on my fan from a distance...but they are thin plastic an not worth the price. Too high a price for the quality. Wish I would not have ordered them. Waste of good money.