A:Answer No, the i3 does NOT have smart mapping... which means you cannot tell it to clean specific areas in your home. The higher tier models (i7, s9) DO have the feature. The i3, however, has a "Clean Map" feature where it tells you where its cleaned. The Clean Map is found in the "history" section in the iRobot Home app.
Not sure how the 675 handles carpet to wood or vice versa... but the i3 does a great job... I have no issues with it getting stuck or turning back thinking it's an obstacle.