While V-Rollers are more resistant to dust and debris, the bearings have a small amount of play in them, so they're not really any more rigid than skate bearings. I've heard that the CNC Routerparts machine in the video is less rigid than their skate bearing model.
My wood and skate bearing machine has been running well for over 5 years now. I've used it for many things, from wood, to phenolic, and even aluminum.
Mine is much more rigid than the JGRO model mentioned above, though. I highly recommend supporting the pipes in some way, as it will greatly increase rigidity.