I want to give this a five-star rating, but am going with 4 stars for two reasons. First, I haven't used it long enough to know what it's life span will be like. If it holds up for a reasonable amount of time with regular use, I will consider giving it a 5th star. Secondly, I am taking off one star because although this item is advertised as a new model, I originally received one with a manufactured date stamp of May 2015, shipped to me at the end of October 2016. The first one I received (from seller Amazon) came in a damaged box and had some scratches on it, so I asked for a replacement. The replacement came with fewer scratches but actually has a manufactured date stamp of December 2014. I received it at the start of November 2016, so it was just shy of two years old on the day it was shipped to me. While not used, it has sat on a shelf for 22 or 23 months before coming into my possession, and I do worry that this could affect its life span. I also feel Amazon should not be selling as new new stock - electronics that have been manufactured within, let's say, the past 6 months or so. Maybe I'm being picky, but when I buy something as new, I'm not happy to learn, after I've already paid for it, that it's actually years old at the time I purchase. Still, this is a great diffuser so far. I can't believe how much scent I get from just a few drops of oil. Though I have a hard time imagining anyone is ever able to get the advertised five hours out of this (the handful of times I've run it so far it's lasted 2 hours, 3 tops, when filled 1/3 full, as directed in the instructions), but I am happy with the run time. For the price it seems to work great. I didn't think I'd want any lights, but I kind of like one of the colors. Note: When the diffuser is running, the lights flicker quite a bit - I think this is caused by the motion of the mist inside the diffuser and not a problem with the leds. Based on its performance so far, I highly recommend this diffuser, but if you're like me, you'd want to be forewarned that what you will be getting is not a freshly minted diffuser.