I am on my 4th roomba.  I originally received the roomba red for christmas many years ago.  I loved it, and was devastated when it died after 10 months.  iRobot replaced it, and the replacement worked for 10 months also.  I went for 5 months without one, and hated the way the dust hair built up between vacuumings.  My husband gave me a 530 for Christmas, and he bought it at Bed, Bath and Beyond.  After 17 months, the 530 stopped working correctly.  With my receipt in hand, I returned the product to Bed, Bath and Beyond, and told them it had stopped working.  They gave me a brand new roomba,...