This cassia oil is not what I expected. I am accustomed to cassia oil smelling very similar to cinnamon, this product, however, smells only slightly cinnamon adjacent. The fragrance of this oil smells, yeasty, slightly woody and sweet, with a slightly sour note that has a hint of cinnamon character to it. It smells almost exactly like Italian panettone bread, except with a woody background. I used the oil in a diffuser and I was initially on the fence, but after a few minutes, I found myself feeling a bit queasy from the smell. So ultimately, I dislike the fragrance, but since scent preferences are subjective, someone else may like it. At least it doesnt smell synthetic. The oil on the diffuser pad remained pungent for about three days. The viscosity is very thin for an oil and I was initially concerned that it would not disperse in carrier oil. But after adding a few drops to sweet almond oil and shaking it, the cassia oil blended evenly into the carrier oil and showed no signs of separating. At four ounces, the bottle is quite large and since cassia oil can be irritating if not highly diluted, if this is used for topical application with a carrier oil, the bottle should last for a very long time. The dropper top is a nice addition, making it easy to use.