What a hoot! I love the concept, but his bearing setup is truly lacking. I think he used a bent sheetmetal race with a 4-ball (instead of 4 ball bearings as stated) sheetmetal retainer, then forgot to grind it smooth or center it.
I'll bet the liability insurance, which would go along with the manufacture of such a toy, would be outrageously expensive. The "CAUTION: Do not look into laser with remaining eye!" stickers would go unheeded, I'll bet.