I have. It's a kids toy with a slow mo video. But I am sure the founders of this seeded this thread with enough fake accounts to make sure it gets its much deserved publicity.
You realize that all new accounts on HN show up with green usernames. Currently, there are only two 'new' users who have posted in this thread, both expressing negative views about the product. If they've 'seeded' this thread with fake accounts, there's no evidence of it.
I confess, the still used as the cover frame for the video put me off of watching it. Is any part of the video not a barely clothed model wearing the skates?
Ugh, no kidding. I want to see what the skates look like up close. I want to hear what they sound like without music being played over the top. There's hardly anything useful in the video.
That said, I've been looking for a decently portable, medium distance form of personal transport for a long time (preferably wearable so I don't have to lug it). I can't take a bike onto a tram. These might actually fit the bill.