iRobot Roomba i4 (4150)

Cleans the entire room quickly and by itself, really gets it clean, can get under furniture, inexpensive

Relatively short battery life, sometimes does not get edges as good as the centre

Convenient time saver. Early ssues fixed. Cheaper then the high end units, cleans the same

Batteries die pretty quickly adding substantial cost to operation 30-60 USD per year