What's so good about Dyson hair dryer? Is it necessary to buy it because it is expensive?

There is no need to buy an expensive hair dryer. Although Dyson's hair dryer is really cool, from the perspective of comfort and cost performance, it is better to buy one that you accept. White has a water ion hair dryer, which also dries quickly. My hair was completely dry in a few minutes, and it was light to hold. I use this one with negative ion function, which is smooth and short-tempered, can replenish water to hair and enhance luster. You can have a look at others. There's no need to wear it.