I realize this was posted almost a year ago, but I was hesitate to try, but my goodness, I am so glad that I did. I did not use 18% FO, I use 15% and the melts came out amazing. They slid right out of the mold, not greasy in the least, and the HT is fabulous. I mean, fabulous. I have re-used my melts a few days now. They sure aren't lying about extending the performance of the melt. I think they quote 33%.
I use 2 in my scentsy warmer and no lies, i could smell the scent outside my door. I used apple orchard from Nature's garden. Hope this helps.