Review Content Great choice Great product -The only two things are a bit confusing (1) read the instruction carefully to make sure filter is inserted correctly. (2) the display readings only illuminates for about 15 seconds then turns off. While the unit is on and working .If for ex. Change the speed, once again it only illuminates for 15 seconds then turns off. Since the user manual does not mention this, I called customer service support and was told this is how the unit operates. Moves air in room and purifies to boot Works great in medium size room! Use this tower purifier to move air in a stuffy room and an added bonus it purifies as well. The ionic purifiers freshen air more quickly, but are much more expensive. Breathing better I used this in my living area and then in my bedroom the first day I got it and the next morning I had no allergy symptoms . I did not cough during the night and have used it that way ever since. It is unbelievable how it has changed my environment and my wellbeing. I am fully satisfied and have told others about it also. Great product This has definitely decreased the amount of dust in my bedroom. I feel like my allergies have improved since starting to use this. Only issue is that it can be a little noisy but its not that big of a deal Dont buy I bought 4 of theses and paid extra for extended warranty . On doesnt work and sharper image will do nothing for me. I have my receipts but they dont care because Im not in their data bank. It only goes back a few years and my warranty was 10 years. Very disappointed in this company. great ability to circulate air! An air purifier is new to me. I selected this for a need to clear up sinus allergy. I researched and compared, then selected the Alen T500 to do all it can but most important to be able to clean air multiple times an hour at a reasonable cost. I can feel the out flow from the other end of the living room! Very nice! This is an excellent Air Purifier. I have just developed an allergy to dust. This Air Purifier came" to my rescue ". would recomend to a friend could tell a difference in air quality in hours Im very happy Used it to move into a rented apartment that had a musty smell. Has been running since I got it & the smells are gone. Im very happy with it.