I purchased 3 of these units and very happy with my purchases. I have one in my room at work and other 2 in bedrooms. Thrilled with size and appearance of these units and portability if needed. Noticeably able to breathe easier with removal of allergens in air especially pet dander . Love how quiet units are and timers are great addition. Thinking about more units as gifts for allergy suffers in our family! Super happy and sleeping better!