Steven Yanni sounds awesome! Great video!
But some of the other videos with other people playing don't make the tone sound nearly as good as in Steven Yanni's video.
They look "weird" as well, but I guess so does a Railboard. http://stashstainlessbass.com/
The basses run around $3000 to $3300. They have 4 or 5 varieties.
Thanks for sharing, Olivier!