Can't tell much of a difference in this machine. I purchased 2 of them and may return because don't think working quite as well as other members advertised. Ran on full with and without ION. My air wasn't any fresher and smelled a bit odd. Could be me, but may have to try another brand to determine that.
This is a great product. It has helped my sinus and nasal congestion effectively. It's quiet and works very well. The only problem is the outside gets very dirty and unable to be wiped clean. I know it's filtering and purifying the air but it's unsightly since it discolors the outside not just where the air comes in and out of it. Otherwise I love it.