Ten weeks. That's how long the basement stairs stayed flagged as a five-alarm hazard on the dustbin tally, the running log I've kept for about two years on every robot vacuum that's rolled through this bungalow. Murph sheds like it's a competitive sport, Beans adds her own contributions to the pile, and somewhere between a Roomba j7+ and a Roborock S8 Pro Ultra I finally got a real robot vacuum review's worth of data instead of just a gut feeling about pet hair. This is the smart home app fight I didn't expect to care about this much: which bot actually earns its keep on a 1920s floor plan with an open stairwell off the kitchen.
Before the receipts: I get a commission if you buy the Roomba or the Roborock through a link on this page, at no extra cost to you. Every number below came off my own kitchen scale, my own phone's decibel app, and my own patience running out resetting a no-go zone at 11pm on a work night.
My 1920s Bungalow Keeps Breaking Robot Vacuum Assumptions
An American Craftsman bungalow built in the 1920s is charming right up until you're troubleshooting a dropped Wi-Fi connection instead of doing literally anything else with your evening. Every smart device that's supposed to work here, including the X-Sense Smart Smoke and CO Detector I put in around the first thaw of this testing cycle, needs the 2.4GHz band specifically, because that frequency punches through thick lath-and-plaster walls in a way 5GHz never manages. A robot vacuum that can't hold that connection back to its dock is just an expensive paperweight with a spinning brush.
The iRobot Roomba j7+ earned its spot for the pet-poop detection, since Beans has moments and I needed a camera that could see them coming before I did. The Roborock S8 Pro Ultra came in because Sam was done watching me hand-mop every time the dogs tracked in rain, and the LG CordZero Robot stayed on as the benchmark I keep circling back to, even though its brush still wraps my hair after about ten runs.
The Mapping Onboarding Nobody Warns You About
Comparing how each app handled first-time mapping was its own special kind of frustration. Roomba's app treated my floor plan like a buggy beta, three full runs before it found the kitchen, plus a Premium subscription nag that showed up before I'd finished cleaning one hallway. Roborock locked in the same floor plan in two runs, and its app is dense enough to be its own skill to learn, but at least it wasn't trying to upsell me mid-onboarding. Whether a map holds up over months instead of just the first week is a different question entirely, one I've dug into elsewhere with a lot more patience than I had left here.
Installing the X-Sense detectors happened in the same window, and it took under fifteen minutes per unit to swap out the sealed alarms that came with the house. The push notification beats the physical horn by a few seconds, which sounded trivial until the night the app buzzed my phone about smoke at three in the morning and the only candle anywhere near that room hadn't been lit in weeks, the kind of false alarm those few seconds exist for. I get into the pairing quirks and the notification lag in my X-Sense Smart Smoke Detector Review for Reliable Phone App Alerts, and where you'd actually mount one of these in an older two-story house is its own separate puzzle I'll save for another post.
Which Bot Actually Survives the Basement Stairs: Roomba j7+ vs Roborock S8 Pro Ultra?
The real test happens at the top of the basement stairs, an open stairwell off the kitchen with no permanent gate, which is exactly the kind of edge case that got my old i3 years ago. Before either of these bots showed up, I'd tried keeping a handheld Dyson parked by the top step for manual spot runs between full cleanings, and that habit lasted about as long as my patience for climbing back downstairs mid-workday. The Roomba j7+ has the brand recognition, but its no-go zone editor is a mess: I had to redraw the boundary twice after the map quietly re-learned itself and nudged the virtual wall a few inches closer to the drop.
Watching the Roborock S8 Pro Ultra clear those same stairs took a lot less drama, and the feature that got a real reaction out of Sam was the mop-lift. "Okay, that's actually smart," he said, which is about as impressed as he's gotten by a piece of plastic in two years of these tests, watching it keep the runner rug in the main hall dry while it mopped the hardwood around it. After a month of daily runs the trade-off settled into something concrete: the Roomba edges tighter along the baseboards in a complex layout, while the Roborock wins on maintenance because you're not babysitting the dock every other day. I laid out the hair-specific side of that trade-off in my Roomba j7 Plus vs Roborock S8 Pro Ultra for Pet Hair comparison, and the suction-versus-battery-life version of this same argument is one I had all over again testing the LG on a bigger floor plan.
Chasing Down the Dander the Vacuums Miss
Even a good vacuum run leaves the air feeling thick in a house with a husky mix, especially the day Murph gets back from a lap around Sahm Park off 56th Street and tracks half of it back inside. I've been running the PuroAir HEPA 14 Air Purifier to catch what the vacuums leave behind, and a true HEPA-grade filter is built to catch what you can't see, which sounds excessive until you've watched what two dogs produce in a week. The actual differences between HEPA grades are their own rabbit hole, one I get into properly in a dedicated review instead of here. My neighbor Reginald Crumpler, two houses down and a retired HVAC guy, stopped by during a filter swap and had opinions about airflow, namely that where you place a unit in a room changes the reading more than the unit itself, which tracks with everything I've measured since.
The noise is where my own patience usually runs out first. The Roomba sounds like a small aircraft taking off when it empties into its dock, but the PuroAir's sleep mode barely registers, my phone's decibel app read it at 28 dB from three feet away, quiet enough that Beans doesn't stir. Dustbin capacity is a related number I track obsessively on the tally itself, how many grams a bin holds before it starts begging for help, and it's detailed enough to deserve its own post rather than a paragraph here. Sam's exact words the week the Roomba's poop-detection camera caught Beans's overnight incident before I stepped in it: "Okay, that one's earning its keep." Whether that avoidance holds up across every kind of mess is a bigger question, one I answer in full elsewhere, since one save doesn't make a pattern. You can read the full noise breakdown in my PuroAir HEPA 14 Noise Level Test for Light Sleepers with Pets.
The Ten-Week Tally
Ten weeks into running both bots side by side, the pattern held steady enough that I stopped hovering at the top of the stairs every time one of them went quiet. The Roborock is the one I'm not constantly fishing out from under the sectional, even though flipping the Roomba over right after a run, brush roll still warm, plastic smelling like it just argued its way up those stairs, remains part of the routine more often than I'd like. Whether you actually need a mop built into the vacuum, or you're better off keeping those as two separate machines and two separate decisions, is a trade-off I've argued out fully in a different comparison; here it's enough to say the mop-lift earned its spot in this house specifically because of that runner rug. Fabiola Tobin, a reader with an all-carpet house, wrote in after my long-term pet-hair review with sharp questions of her own, and her carpet-mode numbers lined up with mine closely enough that I trust this pattern isn't just an artifact of my particular floor plan. The lesson that actually carried past this one stairwell: test the failure mode you're most afraid of, the stairs, the rug fringe, whatever it is in your house, before you trust a bot with the rest of the floor plan unsupervised.
If you're choosing between these two, and your layout has a real edge case like a stairwell without a gate, I'd point you to the Roborock S8 Pro Ultra for the maintenance you won't have to think about, or the LG CordZero Robot if the app experience matters more to you than the mop function ever will. Either one beats a handheld vacuum parked at the top of your stairs, which is exactly where mine used to sit.