Sladda - I made fun of it but it seems to work

Sladda, Billy's roling sister, by Ikea seems to work according to this article. To assemble it, uhm, well it's Ikea, it's always a challenge. But it got some neat features like a low maintenance belt drive and it has a click-on system for attachments.

It's $ 499 but if you're a Family member you pay $ 399. That's not bad, not bad at all.