I recently sold my Roomba i7. It was so loud I couldn't turn it on while I was in the room. It was also very versatile, even with mapping technology. My sister had one and I loved how well it cleans while still being quiet. After purchasing it, I found the mapping technology to be far smarter than my Roomba ever was. It's very quiet, but cleans just as well. Not only does it crash into walls/furniture and slow down as it approaches. It also remembers furniture and understands foreign bodies without remapping all the time. The tank is MUCH bigger. The mop head is very useful. All for 1/3 the price!