I don't have the pet version, but my regular old version has been quite brilliant. I call it, "Killer."
It lurks at its charging station until, at precisely 9AM on Monday mornings, it pounces. The massacre of the dust on the floors and the stuff in the rugs is probably quite brutal, though I'm rarely around to enj...I mean cringe at it.
It seems to work equally well on hardwood, tile or rugs. I slows down a bit on carpet, though that may be clever on its part. More dust, you know.
I do wish the little "don't go here" strip were longer. It's fine for a doorway, but put it on one side of the bed and it's just go around. My bed is just low enough that Killer gets stuck there. Handy to know in case he trades his thirst for dust in for a thirst for blood.
As I am extremely laz...busy, I give it four out of five stars. So far, so good. I paid more for mine, too, so if you are also embarrassingly la...busy, you've little reason not to try it. I've had friends with Roombas and they loved them until the little devils gave out. The Neato has more suction, and a much more predatory attitude. Or maybe it's just me.