A fair diffuser [SEP] I've been diffusing essential oils for almost 30 years, ever since I purchased my first diffuser from Whole Foods back in the 1980s.  This diffuser is not representative of the latest generation of diffusers, but it fits nicely within the last generation.  The latest generation of diffusers are not waterless, cordless (rechargeable) and portable.  I have both types of diffusers in my home and much prefer the latest gen.<br /><br />This is a nice diffuser but is slightly more expensive than it should be, even with the ceramic appointments.  Like all water diffusers you put water in the chamber with a few drops of oil and let it go.  The light is nice but doesn't serve much purpose other than to remind you that the unit is on when you cannot see the cold steam.  I'm not a fan of the whole thing being lit because it does cause me to take a second look if my eyes slightly open while I'm sleeping.  I prefer a thin band of light. Of course on this unit you can turn the light off.<br /><br />It doesn't come with any oil which is actually good.  I find that when an oil is included in with a diffuser it's often the cheapest brand around and smells awful.  It might be enough to turn a newbie off of diffusing if they don't know that high quality oils exist.  I recommend Plant Therapy.<br /><br />I don't buy into the claim that this can be used as a humidifier because the output is just not strong enough.  After shut-off there is always water still left in the chamber.  This is not a good thing because if you want to change oils, you have to diffuse water with vinegar for a couple of run-throughs and then wipe down the inside. Of course there is nothing wrong with left over oil if you don't mind a blend, but sometimes I want one pure smell for a specific purpose.