Roomba past experience: Dirt Dog, 610 Professional, 880. Roomba improvements have been incremental up to now. The s9+ is a step change in performance features that really count. The extractors and the Roomba shape combine for very efficient cleaning; important to us multiple pet owners. The bin is very easy to clean and needs only modest attention weekly. The bag bin is a great addition which means that dust, dirt and pet hairs don't get loose when emptying the bin. Mapping is a great feature for spot cleaning or extra cleaning trouble areas. The cost of this Roomba suggest that you're getting the best - that is correct.