Roomba i6+ Review — is the Self-Empty Dust Bin Worth it?
Costco shows an i4 robot to compare with the i7+ on its site. The link to the actual listing for the i4 does not work though. It appears that the i4 somehow
iRobot® Roomba® i6
IROBOT Roomba i6 i6158 - Fiche technique, prix et avis