I detect some kind of tension in that video. I mean, what those boys need is a good game of tennis to burn off some of that energy. If it's not too cold outside, I guess.
I should record this thing, I am totally digging it. Which also raises the question, I haven't heard what a PLU 87 sounds like, just Ripter's Mega Keyboard Sound Roundup, so it may sound to me like I'm ordering a cruise missile strike, but it may sound high and thin to you.
Edit: Well, scratch that, just listened to an ML-87 on Youtube. About the same, just a bit more mechanical clickety-clackity. I do notice that this Leopold has a ringing coming from the backplate, or the springs, which is interesting.