S400

One S400 owner with a relatively small pool considered it worth the investment. Another explicitly identified S400 buyer described a much easier routine after adding the robot. Those are consistent accounts of convenience, rather than controlled evidence that it outcleans every cheaper model.

A contributor reporting the same model liked straightforward handling and found it less cumbersome than a suction cleaner attached to pool equipment. The discussion includes other Dolphin models too; only comments identifying the S400 or explicitly replying as a same-model owner inform this summary.

The accounts do not quantify fine-silt retention, stair coverage, cable tangling or repair costs. Most emphasis is on general satisfaction. They support the S400 as a useful routine helper without proving a particular lifetime or guaranteed coverage in every pool shape.

An owner with a 12 × 6 metre concrete pool and tiled band found setup and the app straightforward, and rated floor cleaning well. Walls and the waterline were less consistent. Cleaning the robot was easy, though the fine-filter panels took practice. Maytronics replied that the coverage behaviour needed investigation; the thread does not establish a resolution.