A modular robot: the same wire-free base also takes snow-blower and leaf-blower attachments. Pricey once you add modules, but it earns its keep year-round.
Full one-acre coverage with no perimeter wire, and a camera that helps it see boundaries and obstacles. The value pick if you want wire-free at scale.
The reliability benchmark. Whisper-quiet (~58 dB), excellent on grade, and the brand pros trust. Wire-guided, so tree cover is a non-issue.
All-wheel-drive flagship that climbs slopes most robots can't touch. Expensive and wire-guided, but the answer for genuinely rough, steep terrain from a name pros trust.