I just purchased this and it is a quality and well-made diffuser that looks beautiful in my home décor. It combines function and style together. However, I would suggest that the waterline marking be stamped on the inside of the watertank instead of the outside because it's hard to tell when I've reached the waterline unless I hold it up to a bright light. Also, I noticed that a lot of water is left in the container after the diffuser has automatically shut-off so it's a bit of a waste of the diffuser blend. I understand if its a little water left to prevent the machine from running without water but there was quite a lot of water - 1/3 of the tank left. Those are my suggestions for improvements. Keep up the quality products and customers will be forever loyal.