I bought this for my kids who have terrible allergies. I dont like the touch buttons. You have to hit them just right. Also water constantly sits in the bottom of the machine. Everytime you add water to the tank you have to unplug the unit and dump it out and wipe the insides down or else it will quickly develop a slimy coating. Since there is no filter it gets very gross very fast. Lots of meticulius cleaning in the nooks and grooves. But the worst part is we woke up one morning and found the uniy had malfunctioned and sprayed water all over the room. Our wooden floors were soaked, it was up the walls and blinds near the unit and water was standing on the table the humidifier was on. I have no idea how or why the unit malfunctioned, but i returned it for a full refund. Ill also add that using this as a diffuser cannot compare to using an actual EO diffuser. I use Lavender,lemon, and peppermint in my kids diffuser at night before we bought this combo unit. And the oils are evident and string. But using the homedics unit, it seemed that the oil pad absorbed most of the oil and they were more of a light scent for the room as opposed to suspending the oils in the air. Overall the idea of this product is great, but the design and product are seriously flawed. I would not buy it again. I will say i never experienced an issue with the oil tray that some reviewers mentioned.