It is, in fact, a capital "R" that denotes Roomba as a proper noun rather than a generic trademark, though the Band-Aid level interchangeability really does exemplify just how iconic iRobot has ...

The iRobot Roomba Combo 10 Max is a thorough and capable cleaning machine that gets into every possible space in your home to clean. It cleans well, but it is overly dependent on the physical ...