I bought the NOW Solutions Metal Touch Ultrasonic Oil Diffuser for use in my home--love to have various scents & like being able to use essential oils/blends for this. The diffuser is very pretty--the sides are a tree branch-looking cutout pattern. It's LED light rotates through different colours which show through the cutout sides--you can also select the setting to use the diffuser only, without the lights, perfect for use in a dark room (headache, I'm looking at you).

Super easy to use--just fill with water to the mark, add your choice of essential oils, put the cover back on & touch the switch to turn it on. Nearly silent while running (occasionally hear the water bubbling), it produces such a fine mist (a vapour, really) that there's no worry of your table/countertop/etc getting wet. Effectively scents a large room, has an auto-off feature as well, so no worries about leaving it running.