you seem to have a great passion for appliances. Comfort is what you make it. I wouldn’t pay an extra 300$, but that me. If your allergies are that severe- or that factor is important to you, maybe you could spend that 300$ on air filters for your home, or towards a dyson… It depends on what your willing to do to be comfortable. Just because a product works for a large majority of people doesn’t neccesarily mean you will be pleased by it. Appliances are a big investment. No wonder your passionate…
Your guess is as good as mine. Good luck!