We have the original version of this model but with the improved filter. If you get a good one it works great. But at this price, I would spend more and get a new one instead. The brushes had a problem on the original if you did not keep the metal bearing clean. This has been retrofitted with a plastic bearing to eliminate the issue but it leaves a gap of no brushes that you can see in the underside photo. Also the latest batteries seem to hold a lot more juice than the originals which you may be getting with this one. Generally speaking, if you have lots of area rugs, the ability of the Neato to handle them depends on the brush protector and bottom squeegee. Apparently their tolerances vary on those and when I complained about performance they sent me a new bottom plate which fixed the problem. But with a refurbished unit you may not get such good customer service.