What is the difference between the Evolution and Featherweight dryers?

Both dryers have a cool shot button and a switch with 2 speed options. The Featherweight has a constant medium heat.The Evolution also has an extra switch with a choice of 3 heat settings. This gives you a choice of having the medium heat setting, or a hotter heat or a lower heat. The lower heat is useful if you have damaged, fragile or color-treated hair.Both weigh 14oz /384g. The Featherweight is 1800W and the Evolution is 2000W.