The roller seems to work pretty well, but they do leak a little bit ...
These are my first roller bottles, so I have nothing else to compare them to.  The roller seems to work pretty well, but they do leak a little bit sometimes, so make sure you don't just throw it in your purse or set it down on something without making sure you have wiped off any excess.  Essential oils leaking out can definitely do some damage to painted surfaces.
Rating: 4 stars