Dyson

Their filtration is competent but not exceptional for the money. Cheaper HEPA units often match clean-air delivery at a fraction of the cost; the Dyson premium buys sensing, design, and the fan function.

Typically several years before noticeable capacity loss. Batteries are replaceable, which materially affects long-term value against cheaper sealed units.

The temperature regulation is real and measurable. Whether it justifies the price depends entirely on how often you use heat styling.