I find it funny that the guy says stuff like "I'm not seeing any lag, it's very fluid" and I can see stuttering in almost everything he touches. I think that people who claim there is no lag, just aren't sensitive to it so they completely over look it.
Also, did you know that some people can't even see screen tearing in video games when v-sync is off? I find that remarkable because I can see even the slightest hint of screen tearing when it occurs. It really bothers me, but some people are blind to it. It's amazing how different humans can be.
I'm very sensitive to lag, but that video seemed pretty smooth...only lag I saw was dragging down the search bar and scrolling in YouTube...otherwise the home screen was smooth. He didn't really do much, and when I saw "SPOILER ALERT: Its a lagfest" I expected a lot worse.