It works, and does what it says it does. That being said, I find the scrolling behaviour it offers highly irritating. It's very smooth and smartphone-like as advertised, but that seems to be a better fit for touchscreen interaction than when using a scroll wheel. I uninstalled it since I find the default 3-line scroll much more usable. The ramp-up and ramp-down time when using this addon is much longer – when you stop scrolling, it doesn't actually stop where you are at that moment, but inertia-scrolls onwards for a full second. So if I'm looking for something on a page, this add-on makes it much more difficult to pinpoint.