One additional improvement he could make is upgrade to a aerovac bin, it will work on a 500 series. https://www.irobot.com/en_US/replacement-aerovac-bin/4359682

One additional improvement he could make is upgrade to a aerovac bin, it will work on a 500 series. https://www.irobot.com/en_US/replacement-aerovac-bin/4359682.html https://www.irobot.com/en_US/replacement-aerovac-bin/4359682... I have been using 500 and 600 series for almost 10 years to clean my garage, they do a great job and are incredibly tough.