Question about Dyson Cool Formaldehyde

I only know the formaldehyde unit, which I bought recently. It's ok and very quiet when not on the highest setting (we can sleep with it). Air quality feels better, but allergy time is over. The promise of "Cool Link" is a bit disappointing ... in the end an expensive fan. The next hay fever period in spring 2023 will show whether the CHF 799 is worth it. I honestly have a little doubt about the cost-benefit.... the cheaper air purifier (with water) from the Migros also did well. Needed cleaning often but was equivalent.