Review (2/5): Fell apart after two uses.
I only got to use the product twice before it fell apart when I went to use it the third time.
When it first arrived, I fill the reservoir with some of the oil I have. The roller applied it evenly on my skin. It was smooth and there was no discomfort. However, it did seem that some oil was leaking out of the reservoir as I used it. I also found oil pooling on the bottom of the product.
When I went to use it the third time, the roller itself popped off as I tried removing the cover from it. No matter what I did, even after emptying the reservoir and drying it, the roller would not stay on. Maybe it's a defect with mine, but I had to junk it.