As soon as it arrived I was running about to find something to open the box like it was xmas or something, then pulled out a heavy shiny plug that made a dissapointing clunk. What this has is a hollow body with three large bearings that fall to either end when tipped or moved around, far from the Newtons Cradle description. So far I've not had much time to play around with this as it was all in a rush before work, but the instructions on rocking back and forth lead to it feeling like someone is lightly tapping on the plug, and a sound like being raped by a tube of Smarties.
i saw those at MEO. Thought about getting one. Post a review. BTW, I think the thing I miss most about the time I spent in the UK was Smarties. Got M&M's beat all to hell and back.
I might have a play with it later, not much time tonight though Took a few pictures, so you can see a bit more. It does have a very nice feel to it, seems well made, and the metal retains a little heat as I found out after I cleaned it and washed off in cold water