The Dyson Supersonic hair dryer retails for $399.99. As one of the most expensive personal hair dryers on the market, we were eager to test it out. Follow Tech Insider: On Facebook More from Tech ...

but when I got the opportunity to try the Dyson Supersonic hair dryer, I knew I had to give it a go. The Dyson Supersonic topped our list of the best hair dryers for a reason. Not only does it ...

Then there was the fact its first hairdryer, the Supersonic, had a retail price of almost US$400 ... safe for hair. I find ...