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 have 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 does not 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 have not found any solution to this problem but if anyone knows of one please share