So far the Dyson vacuum is far better than the one that it replaced, and it cleans the carpets much more thoroughly. It is not as heavy as some critics had me believe, and it came with 8 handy attachments, which I have yet to use. I like the long extension wand that allowed me to vacuum the stairs without lugging the vacuum along; it stayed at the bottom, and I only needed to stretch the wand and hose to reach all the way to the second floor. The power cord is conveniently long, too, which saves me from replugging as I move from room to room. I expected the roller brushes to stay cleaner, and not become wrapped with dog fur, but it hasn't been too bad yet. So far, it has made the job of vacuuming much easier.
We bought this vacuum only for our long threaded area rugs. We use our Dyson V6 stick vacuum for everywhere else. (We love their stick vacs) The problem with the Animal ball vacuum is that it is too difficult to lock (and keep locked) at 90 degrees so that you can repeatedly vacuum while pulling. Whenever I try to push if forward with the head elevated off the ground the locking function gives way and the head falls down, then I can't push it forward anymore because it pulls on the carpet so hard that it can only functionally be used on long carpet when pulling backwards. I gave it three stars because it would work okay on short carpet or other areas where you are not required to lock it's position. For my use type it is the most annoying vacuum I've ever used.
I was impressed at the good condition of the refurbished unit. You could tell it was not brand new, but you had to look very closely. Appeared to have new filters and seals. Only four stars because it’s not the miracle vacuum that Dyson markets it to be. It does clean better than any vacuum I have ever owned. Temper your expectations that vacuuming will somehow be magically fun and effortless and you will be satisfied.