I first purchased the smaller blue one. After unpackaging it and charging, I realized the brushes looked they had a bad case of alopecia. Brush fingers sparse and far apart and hardly any power. Took it back and exchanged it for the 2945z. It has more brushes, but is amazingly under powered and the dirt collector is clumsy and messy. Years ago, I had the v1900. It had great power, edge cleaner and one step to open dirt bin. It was used for quick pickup in a house with a cat and later a very large hairy dog. I had that through 3 batteries and a broken handle. I hoped I would be replacing that one. No such luck. Highly inferior product. It bogged down when moving from carpet to throw rug with short pile. Not a good product at all. I am disabled and on low income and extra money is hard to come by, especially for inferior products.