Battery Life, Noise Levels and Cut Quality: Numbers That Separate WORX M500+ From SILENO City 500

When our second child arrived, my weekend “me time” quietly disappeared under a growing list of chores, and mowing our 500 m² lawn was the one I resented most. An hour behind a noisy mower in the sun doesn’t sound awful until you’re doing it every week after a full-time job. That’s when robot mowers start to make sense: they don’t magically give you a show-home garden, but they turn an annoying, regular chore into something that just… happens in the background. The real-world questions are simple: will it cover the whole lawn reliably, will it handle that one annoying slope, and can it run without sounding like a hairdryer under the living-room window? Only after that do you start caring about app controls, hose-cleanable housings and whether your neighbours will complain.

In our case, I tried both the WORX Landroid M500+ WR165E and the Gardena SILENO City 500 over the same 500 m²-ish family lawn. The WORX felt like the “techie” option from day one: you connect it to Wi-Fi, open the app, answer a few questions about how often you want it to mow, and it builds a schedule for you. It’s rated for lawns up to 500 m², can handle slopes up to about 35%, and uses a wider 18 cm cutting deck, so it feels confident on our slightly uneven back section. You do hear it working—around 67 dB(A)—but it’s more of a soft humming than a harsh mechanical noise. The Gardena, by contrast, feels like the quiet, polite guest who tidies up without being noticed. It’s also built for up to 500 m², but officially rated for gentler slopes (around 25%), and its headline trick is noise: about 58 dB(A) and a slightly narrower 16 cm cutting width, which, in real life, means we can let it run while the kids nap and almost forget it’s there. It still has app control and an on-body LCD, but you interact with it far less—set the schedule once, and it just goes, even if it’s raining. Day to day, the WORX just needs a quick hose-down and a brush underneath when things get muddy; the SILENO is similar, usually looking presentable again after a short rinse and wipe. In practice, both mowers give roughly an hour of mowing on a full charge before heading back to the dock, so they work best by nibbling away at the lawn little and often rather than trying to do all 500 m² in one heroic session.

Quick spec snapshot

After a full season, the split between the two is fairly clear. The WORX M500+ made more sense for the “busy but slightly geeky” version of me: our garden isn’t a simple rectangle, there’s a trampoline, a shed and a narrow side strip, and I actually like tweaking zones and schedules in an app. In return, I accept that it’s a touch louder and that setup takes a bit more thought. The SILENO City 500 feels better suited to someone who sees the mower as an appliance, not a gadget: your lawn is mostly flat, noise is a big deal because terraces and bedrooms are close, and you want something that just gets on with the job, even in the rain, without demanding attention. If your main priority is conquering awkward slopes and complex layouts, the WORX ends up being the safer bet; if you want a “barely-hear-it” robot that you almost forget you own, the Gardena quietly wins. In both cases, prices move around with seasonal promotions, so it’s worth treating the product page as the final word before you buy.