Frequently Asked Questions

Which Roomba is best for avoiding obstacles like toys and cords?

The j‑series, especially the j7, uses a front camera to see phone chargers, socks, and even cat poop, and it has never eaten a toy or wire in three years of testing.

What is the difference between the i‑series, j‑series, and s‑series Roomba?

The i‑series is budget with basic navigation; the j‑series adds object avoidance and is best for pets and kids; the s‑series is premium with a D‑shape for corners and the strongest suction of any Roomba.

Which Roomba is best for pet hair?

The j‑series, particularly the j9 with 2500 Pa suction, handles shedding well on medium‑pile carpet; the j7+ also works well and never eats toys.

Does the Roomba Combo mop well?

The Combo models offer light mopping like a damp Swiffer, good for juice spills but not for scrubbing dried‑on messes like peanut butter.

The Roomba Confusion Explained (We’ve Got 11)

People ask me all the time: “Which Roomba should I buy?” And honestly, the answer used to be simple. Now there are eleven different models in my basement alone, and that’s not counting the variations with self‑emptying bases or mopping attachments. I’ve got them all because I test them for a living, but also because I have two kids, a shedding dog, and a cat who likes to knock over cereal. Sparkles (she’s seven) has named every single one. The i3 is “Mr. Bump,” the j7 is “Captain Laser Eyes,” and the s9 is “The Wedge.” She’s not wrong. Let me clear up the confusion so you don’t end up with a Roomba that can’t find its way home.

Key Specs & Features That Actually Matter

The biggest source of confusion is iRobot’s naming scheme. The letter tells you the series, and the number tells you the generation. Here’s a quick breakdown of what those letters mean in a real home.

The i‑Series (budget)

  • i1, i3, i4, i5: These use basic navigation (random bump‑and‑turn in the i1, more structured in the i3 and up). They clean well on bare floors and low‑pile carpet, but they’ll miss spots in cluttered rooms. The i3 and i4 can self‑empty if you buy the Clean Base separately. No camera, so no object avoidance.
  • Battery: ~60‑90 minutes.
  • Suction: Good for daily pickups, but not deep carpet cleaning.

The j‑Series (best for pets & kids)

  • j7, j7+, j9+, j9 Combo: These have a front camera that sees obstacles – phone chargers, socks, even (allegedly) cat poops. In three years of using a j7+, it has never eaten a toy or a wire. That’s a miracle in my house. The j9 adds better suction and a mopping pad (the Combo version carries water). All j‑series models can self‑empty.
  • Battery: 75‑120 minutes, enough for 1500 sq ft.
  • Suction: Strong enough for medium‑pile carpet. The j9 gives you 2500 Pa, which keeps up with our dog’s shedding.

The s‑Series (premium & square)

  • s9, s9+: The s9 is D‑shaped so it gets into corners. It has the best suction of any Roomba (but still below a full‑sized upright). It uses a camera and floor‑tracking sensors for efficient cleaning in rows. It’s expensive, and the self‑emptying base is huge. Sparkles calls it “The Wedge” because it always jams itself into the corner behind the couch.
  • Battery: 90‑120 minutes.
  • Suction: 40x more than the i1, but still not as good as a Sebo or Miele. Good for high‑traffic areas.

Then there’s the Roomba Combo series (j9 Combo, i5 Combo) that add a mop that lifts for carpets. Honestly, the mopping is light – think damp Swiffer, not scrubbing. If you have tile or hardwood and kids who spill juice, it’s a nice bonus. But don’t expect to remove dried‑on peanut butter.

Who Each Roomba Is For

You have kids and a dog (or cat) and you’re tired of stepping on crumbs

Get a j‑series. The j7+ is the sweet spot – you get object avoidance so you don’t have to pick up every single tiny thing before every cleaning. The self‑emptying base means you empty the bin once a month instead of daily. The j9+ is worth the upgrade if you have thicker carpet or a bigger house (1500+ sq ft). I have a j9+ running twice a day, and it keeps the main floor surprisingly clean. Sparkles once said, “Captain Laser Eyes is the only parent who never yells about toys on the floor.” She’s not wrong.

You rent an apartment or have mostly hard floors

The i3 will do the job. It’s not smart about avoiding cords, but if you clear the floor first, it works fine. The i1 is cheaper but doesn’t map – it’s honestly frustrating to watch it bounce around the same spot for ten minutes. Spend a little more on the i3. And if you want self‑emptying, get the i3+.

You have large rooms, corners, and want the best possible clean from a robot

The s9+ is for you, if you can stomach the price. It cleans row by row, which saves time. The corner‑cleaning is real – it gets into that 90‑degree joint where the baseboard meets the cabinet. But it’s louder than the j‑series. And if you have furniture with low clearance, it gets stuck. The s9 is a luxury item, not a necessity.

Pros & Cons (From Real Life, Not Spec Sheets)

The i‑Series

  • Pros: Affordable, decent cleaning on hard floors, quiet enough to run during homework, no camera privacy concerns.
  • Cons: Random navigation misses entire rooms, no object avoidance (it will eat headphones), weak on medium‑pile carpet, no mopping ability (except i5 Combo, which is fine but not great).
  • Real‑world pain: Our i3 once spent 45 minutes stuck behind a pair of sneakers. Sparkles had to rescue it.

The j‑Series

  • Pros: Excellent obstacle detection (saves you from picking up everything), good battery, solid suction, self‑emptying is a game‑changer, app is the best in the business. The j7+ with a pet + kid house? Chef’s kiss.
  • Cons: More expensive than i‑series (j7+ is about $500), the camera can’t see black rugs (it treats them as a drop – funny but annoying), mopping is too light for sticky messes. The j9 Combo’s water tank is small.
  • Real‑world win: The j7+ filmed our cat throwing up and sent us a video alert. “Your pet did something interesting,” it said. Gross. Helpful.

The s‑Series

  • Pros: Best corner cleaning, powerful suction, fast navigation (cleans a 1000 sq ft room in under an hour), works well with the automatic dirt disposal.
  • Cons: Expensive (over $700 with base), loud (sounds like a blender), the D‑shape can get stuck under low furniture, self‑emptying base is enormous – it won’t fit under many cabinets.
  • Real‑world rage: The s9 slammed into our fireplace hearth so many times I had to put a bumper pad on it. Sparkles named it “The Wedge” because it always tries to shove itself into gaps that aren’t there.

Verdict: Which One Should You Buy?

If you have a typical home with kids, pets, and random floor debris, the Roomba j7+ is the one I recommend to every friend who asks. It’s not the cheapest, but the peace of mind from not having to pre‑clean the floor before the robot cleans is worth every penny. You can run it while you make dinner. It won’t eat a Lego. It empties itself. It has a camera that learns your floor plan, so after a few runs it actually knows where the dining table is and cleans around the chairs properly.

If your budget is tighter, the i3+ is a solid compromise. No object avoidance, so you’ll need to pick up toys and cords first, but it self‑empties and does a respectable job on hard floors and low pile carpet. Don’t buy the i1 – it’s too frustrating.

If you have a very large home, wall‑to‑wall high‑pile carpet, and you want corner‑to‑corner coverage without breaking out a manual vacuum, get the s9+ – but be ready for the noise and the price. Also, measure the base location; it’s 17 inches tall.

And if you want mopping that actually matters, buy a separate dedicated mop (we have a Scooba, but seriously – iRobot’s mopping robots are better than the Combo models). The Combo is fine for quick maintenance, but it won’t replace a weekly mopping.

All of my eleven Roombas have a job. The j7+ runs the main floor daytime. The i3+ runs the playroom at night because it doesn’t wake the kids. The s9+ visits the carpeted stairs rarely (it doesn’t do stairs, but it does the hall). Sparkles’ favorite is the j7 because “it waves its eye at me.” I don’t know about the waving, but I do know one thing: you only need one good Roomba, not eleven. Save yourself the confusion and buy the j7+.