Yeah I call it "scroll jacking" and despise it. It's bad form because the user expects to be in control of their scroll and it to react in a certain way....and then it doesn't. A lot of parallax sites do it to jump between sections instead of scrolling through. I think the animation / acceleration works on his homepage because it's more natural and similar to what we are now used to due to animations on our phones, etc. On my mac, I can scroll up on certain apps (twitter, sparrow) to initiate a refresh, just like my phone. If I scroll to far up in chrome it goes to reveal the underbelly and then hops back: I will say the scrolling on that page is much more annoying on smaller screens because of the responsive height code. On my big screen, it's sweet.
