It is so nice to be able to breathe without the heat that a warm humidifier puts in the air. As an MS sufferer anything that can cool down the air going into my lungs (which are also saturated with lung issues) making it easier to breath instead of heavy air is wonderful. This was an inexpensive solution to a headache of a problem. I run my constantly for relief and am able to cut back on my oxygen due to the ability of this machine pulling the toxin particles out of the air and giving me the pure air I need to breath. It is my little machine that could. Honestly, it is my freedom in bubbles! Output Volume The output of this is fantastic. I can fill it and it will run for 12-14 hours on HIGH. If I put it on low than it will go at least a full day usually two without a refill. That is remarkable for a humidifier of any cost. Performance Very high performance! Again 12 hours on high and 24 on low minimum performance from it. Usually more! Ease of Cleaning I wash the filter every other run that I fill it up so usually once a day and it is so easy! All I need to do is run it under water and shake it dry a bit. Pop it back in and put the cover on. Rinse out the holder and I put my distilled water in and then put it back in its place and presto we have fresh air. Durability My little machine that could. Has been going for nearly a year without even a sputter. Haven't even had to change the filter yet! And I was told I would need to change it after 6 months. As long as you take care of it this will last and last. Design Small compact design to fit in practical spaces. I have mine set up next to my bed and love that I don't have a big bulky machine to trip over with my wheelchair.