When I visit web pages based on scrolling, I always try them with a macbook trackpad (or magic mouse) and then with a "click"-scrolling classic mouse.
It's usually great with the smooth scrolling of the trackpad but it loses all its effect with the classic mouse.
Terribly jerky scrolling on my Chrome v 42.0.2311.135
The sidebar floating on screen is buttery smooth
scroll interfaces, like this one, are terrible on tablets. After a swipe, effects have to wait until the page stops then everything plays catch up. More often, it crashes the browser... Like it just did to me on my iPad.