We use another brand, Therapure, from Costco, about $100, and like it. We have had a couple others before, including a $200 one from Wal-Mart, and this one works the best and is the easiest to clean of the ones we tried. We normally turn it to night mode when sleeping, but will leave on a higher setting in noisy locations as a white noise generator. We have not tried Dyson, but the brand has a great reputation.