Good, but could be great
SPA PRO™ Aromatic Diffuser White Oak
lots of things going for it but has 1 major design flaw; namely, failure to retain settings when power is turned off. Diffusers work best when periodically run on cycles on a timer (such as on 10 minutes and off for 50 minutes). When used on a timer, it defaults to "off" thereby thwarting a timer and the benefits of a timer. So, one is left with continuously running the diffuser. Which, for many, is perfectly fine.
The good things: works very well and has a relatively large reservoir.
Would be PERFECT if it could be used on a timer.