Saw the Roland kit at several shows and it's indeed pretty amazing...

What really gets me is how the stuff is demonstrated: Typically you would see a large group (up to 20, 30) of people with headphones around what looks like a complete drum kit, someone playing it in full swing, arms and legs flapping and waving furiously...

Bizarre thing is of course that without headphones you don't hear anything (the little noise that is made is lost in the hubbub of the show itself. Weid but fun spectacle!

Cas.