I bought my first 1200 10 years ago, and was impressed with its long life and excellent service running 24/7! Once I got it set up in my bedroom, I no longer awoke every morning sluggish with a major sinus headache due to my dust allergy! It was the best investment I've ever made to reduce the effect of allergies in my life. I even take it with me when I travel. Very well made, and unlike the big box store machines, the filter replacements are reasonable! Buy with confidence.