These are great. Just like their smaller counterpart they deliver a wonderful aroma and filling them less often. 500ml not just 300ml almost doubles the capacity. I start them out on high the 1st hr then on low and they turn off automaticaly when they run empty. About 18 hrs of enjoyment. All the oils to chose from you are going to love these. Let the color change or select your favorite to match any decor.
G. Dunlap