This Holmes humidifier works for me every night making the air in my bedroom moistened. It holds a lot of water (2.8 gallons), so it's easy to just fill it up about once a week and then run it each night without having to bother about filling it up again. That said, I do keep it at the lowest setting, just so I can moisten the air a bit. This humidifier really did wonders for my breathing, and keeps my nose from getting dried out and uncomfortable during the winter. For allergy suffers like me, this is a huge relief and convenience. It's also easy to refill: you just simply take off the water holder unit from the base and fill it up. I'm a small, not particularly strong, petite person and I have no trouble lifting the tank with the water and carrying it from the sink back to my room. So, in my opinion, it's the perfect size: both for ease with carrying and refilling it, and with the fact that it holds enough water for the week. Output Volume Large 2.8 gallon tank holds enough water to last me for the week. Performance Moistens the air and gives me relief in breathing during the night. Ease of Cleaning Simply remove the tank from the base and wipe both the tank and base clean. Durability Runs every night without problems. Design Perfect size and shape for functionality and ease in refilling.