Oils are great, refilling is a struggle [SEP] I was so excited to get this product, and am still using it. I use it daily at least. I would say it diffuses a moderate amount. Less than any other one I've had from Walmart or young living. But it still does the trick. The oils smell wonderful and I have enjoyed them. I find the amount of oils you receive in this bundle to be a big perk! The downside of this diffuser is the top is difficult to remove.  It doesn't just pull off. I have to use my fingernails to pry the top off, and wiggle it. The whole process is quite frustrating. The top pieces have since come apart because of this.  I haven't found any solution to this problem, but if anyone knows of one-please share!