I was very happy time ago when I discovered this plugin, Scrollmagic for WP – Wow!

It's amazing, but unfortunately there are also some incompatibility issues. Problems with Revolution Slider, Betheme and Safari, disappearing items after window resize. So I cannot give 5*. We could resolve only the first.

Update to 4.0 is not without a lot of extra work (if it works...) New Workspace seems a copy of Revolution Slider. Documentation lets a lot of space to improve.