up until the end, I also thought "so good you won't be able to leave it" was the intended message.
It also recalled an old halo commercial on the lines of "I used to have a boyfriend, then halo came" (not sure if it only aired in my country or worldwide).
Frankly while I think the ad is fun, it does not seem to be convincing. But that's probably not the point, I guess the only goal was to have this become some sort of viral video. People only need to be exposed, not convinced.
Watching this one with the sound off completely reverses the intended effect. At least one person I've seen mention it on Twitter wasn't paying attention to the sound and thought that Windows Phone 7 making you fall down the stairs was the point of the ad.
Lots of people don't pay that much attention to adverts, and what they'll take away from this is: people are dicks with Windows Phone 7.