The Oomphed! website specialists advise you to think twice before buying a product. You should buy a reliable unit regardless of the cost. It seems that you can certainly invest in a product that will last a long period of time and not damage the hair in the process.
It is certain that people think about dryers as being a long term investment. It is not like you are going to use it for a month and then throw it away. The reality is that once you buy a hair dryer, you will use it for many years to come.