We'll be comparing two Roomba products in the opposite ends of the price spectrum: the I3 and J7.
iRobot Roomba Combo j7+ Self-Emptying Robot Vacuum
Filter for iRobot Roomba i3(3150) i4(4150) i7(7550) i8(8550) j7
iRobot Roomba i3+ Review: Was It Worth It?
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Roomba J7+ Review - Cordless Vacuum Guide
Roomba J7 vs. I3 - Cordless Vacuum Guide
Roomba J7 vs. I3 - Cordless Vacuum Guide