Not sure, but I would LOVE to see a review of this one. I'm sure that one will be posted sometime in the near future.
I do own a different Fun Factory toy, and if this uses the same kind of silicone, I'd say that it requires about an "average" amount of lube - not really more or less than my Tantus ones or other toys. The Yooo seems to be more for external than internal use, though, so I wouldn't think you'd need much at all. Those balls don't look particularly big or hard to insert if you so desired.