Quick Answer: The Sunseeker S4 ($1,799) is the only model in Sunseeker’s five-mower lineup built around 360-degree 3D LiDAR instead of RTK satellite positioning — it maps your yard by scanning it rather than relying on a clear sky view, and handles passages as narrow as 31.5 inches. But that precision has a real trade-off worth knowing before you buy: at 0.25 acre of rated coverage, the S4 covers less ground than the cheaper $1,599 X3 Plus (0.3 acre) and barely half of the $1,499-sale X5 (0.5 acre), making it the second-smallest coverage in the whole lineup despite sitting in the middle of the price range.
Sunseeker’s own site already lists the S4 alongside the V3, X3 Plus, X5, and X7 in its lineup roundup — but the S4 has never gotten a dedicated look here, and its one genuinely different spec (LiDAR instead of RTK) deserves its own explanation, because “more sensors” doesn’t mean “more yard” in this case.
Sunseeker S4 at a glance
| Spec | Sunseeker S4 |
|---|---|
| Navigation | 360° 3D LiDAR + Vision AI (wire-free) |
| Coverage | Up to 0.25 acre (1,000 m²) |
| Max slope | 42% (22°), rear-wheel drive |
| Cutting width | 7 inches, 1.6-3.2" height range, 6 blades |
| Noise | ~60 dB |
| Weight / rating | 26 lbs · IPX6 waterproof |
| Narrowest passage | 31.5 in (80cm) |
| Maps / zones | Up to 5 maps, 100 zones |
| Price | $1,799 list (Sunseeker, Home Depot) |
The honest trade-off: precision mapping, not more acreage
Here’s the part the spec sheet alone doesn’t make obvious. Within Sunseeker’s own five-model lineup, price and coverage normally track together — the $599.99 V3 covers the least (0.15 acre), the $2,699.99 AWD X7 covers the most (0.75-1 acre). The S4 breaks that pattern: at $1,799, it costs $200 more than the X3 Plus ($1,599) and is close to the X5’s $1,999.99 list price, yet it covers less ground than both — 0.25 acre versus the X3 Plus’s 0.3 acre and the X5’s 0.5 acre.
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What you’re paying for instead is LiDAR’s actual strength: active scanning that builds a precise map without needing a clear view of the sky, and the ability to navigate passages as narrow as 31.5 inches — the kind of tight side-yard gap between a fence and a house that can confuse RTK-only models relying on satellite signal. Per Sunseeker’s spec sheet, the S4 can also store up to 5 separate maps and manage up to 100 no-go zones, which matters more in a cluttered, obstacle-heavy yard than in an open one.
Where it actually earns its price
Best for: tree cover, obstacles, and tight side yards
- No sky-view requirement. RTK models like Sunseeker's own X3 Plus and X5 need a reasonably open view of the sky for satellite positioning. The S4's LiDAR scans its surroundings directly, which holds up better under tree cover or between buildings.
- Narrow-passage navigation. At 31.5 inches, the S4 can thread gaps that trip up wider or less precisely-mapped mowers — useful for yards split into front/back sections by a narrow side path.
- Multi-zone memory. Up to 5 stored maps and 100 zones covers properties with several distinct, separated mowing areas.
What real owners found after a month
Tom’s Guide ran the S4 for a full month and came away seriously impressed overall, with one specific, fixable complaint: in the default cutting-direction setting, the first several mowing sessions left faint rows of slightly longer grass between passes before the pattern filled in evenly. That’s a settings quirk, not a hardware flaw — switching the cutting pattern resolved it.
The more practical annoyance showed up on multi-zone lawns: because the S4 doesn’t automatically move itself between separated yard zones, the reviewer had to monitor the app’s battery indicator and manually open a gate to let the mower through to its dock, then let it back out once charged. On a single open lawn this never comes up — it’s specifically a multi-zone, gated-yard problem.
Sunseeker S4 vs the rest of the lineup
| Model | Navigation | Coverage | Price |
|---|---|---|---|
| V3 | Vision AI | ~0.15 acre | $599.99 |
| X3 Plus | RTK + VSLAM + Vision AI | ~0.3 acre | $1,599 |
| S4 | 3D LiDAR + Vision AI | ~0.25 acre | $1,799 |
| X5 | RTK + VSLAM (AONavi Pro Fusion) | ~0.5 acre | $1,499 (sale) |
| X7 AWD | RTK + VSLAM + Vision AI | 0.75-1 acre | $2,699.99 |
If your yard is open, flat, and has a clear sky view, skip the S4 and buy the X3 Plus or X5 instead — same brand, more coverage, equal or lower price. The S4 only makes sense if tree cover, obstacles, or a narrow side-yard passage are the actual problem you’re solving.
Sunseeker S4 by the numbers
- 0.25 acre: The S4’s rated coverage per Sunseeker, Home Depot, and Walmart’s listings — the second-smallest in a five-model lineup, ahead of only the $599.99 V3’s 0.15 acre.
- $200 more than the X3 Plus: The S4’s $1,799 list price versus the X3 Plus’s $1,599 — despite the X3 Plus covering 0.3 acre, 0.05 acre more than the S4.
- 31.5 inches: The narrowest passage the S4’s LiDAR can navigate through, per Sunseeker’s spec sheet — relevant for gated side yards that stump wider or satellite-reliant mowers.
- 4.6 out of 5: The S4’s average rating across 97 reviews on Sunseeker’s own product page as of this writing.
The bottom line
The Sunseeker S4 is a real, well-reviewed mower — just not the obvious pick its mid-lineup price suggests. Its 3D LiDAR buys precise mapping, no sky-view dependency, and narrow-passage navigation, not more acreage. If your lawn is open and flat, the cheaper X3 Plus or the larger X5 cover more ground for the same or less money; if tree cover, obstacles, or a tight side-yard gap are the actual obstacle, the S4’s LiDAR is the one in Sunseeker’s lineup built to handle it. For the full current lineup and which model fits your yard, see our Sunseeker robot mower guide, or compare the brand head-to-head against the premium name in our Sunseeker vs Husqvarna breakdown.