A user reviews the iRobot 530 Roomba Vacuum Cleaner Robot: “The iRobot 530 Roomba Vacuum Cleaner Robot is much more autonomous than the 4100/4200 series (the previous model) that means it won’t get stuck as often on things like floor vents, cords or rugs with fringe. It is slightly taller than the previous model so if you want to use your older virtually walls you must put something under them about a half inch thick and they will work fine. The 530 does not clean as well as the 4100/4200 due to a less aggressive brush design. There are a lot fewer bristles, they are shorter and they do not go completely around the main brush since the brush alternated bristles with rubber flappers (like the secondary take up brush). The net result is cleaning is less aggressive especially when removing pet hair from carpets. The new brushes also have a design flaw the old brushes did not. Pet hair now routinely get into the gear drive housing (the square socket the brushes fit into) and prevents the brushes from rotating. This means the iRobot 530 Roomba Vacuum Cleaner Robot needs to be cleaned nearly every time it is used and it is hard to do because it really wedges itself in that area. Also, the way the brushes are now designed there are lots of areas fro hair to build up that are hard to completely clean. This is a real issue when you have pets.
If your primary concern is removing pet hair from carpets, you may be better off with the older model. If your primary concern is complete autonomy with maybe 90% the cleaning power, go with this new model.”