We have a daughter with eczema, and in the winter a humidifier is essential for her comfort. We have been using this in her room every winter since she was born, so for about 4 years. It is still running great, and we are really happy with it. I only wish it were larger. The reservoir holds about a gallon, which is more than enough for one night, but not enough for two. I really like that this model doesn't need a filter, and is relatively easy to clean. The only part of ti that is hard to clean is the water reservoir. The opening on it is tiny, about 3 inches in diameter i would guess. We have hard water and so there is a scummy buildup in there i don't care for. We treat it with bleach, but you really need to be able to wipe it off to fully remove it. Output Volume This machine has an output dial that lets you choose the rate of steam. It works very well and has a really nice range of choice. Performance It works great after 4 years. I think that speaks for itself! Ease of Cleaning It is easy to clean the heating element, but not the reservoir tank. Also, cleaning the heating element needs to be done about once a week if you have hard water like us. We let it soak in vinegar for 6 hours or so before scrubbing and rinsing. This is a bit of a hassle, but are happy to do it if we don't have to pay for a filter. Durability This machine is still running strong. I have a feeling we will get at least 2 more years out of it, maybe more. Design I would have given it a 10 except I wish i could have access to clean the reservoir completely.