Roborock S4 Max review: Roborock's latest robot vacuum is another winner

Roborock's S4 Max is an evolution and replacement of its S4 robot vacuum, the company's first model to not include a wet-mopping function. "MAX" might seem to promise some grand upgrades, but the vacuum offers mostly small, but effective refinements on its predecessor. Cosmetically, the S4 Max looks identical to the S4. On top is a pair of rubberized buttons that activate auto cleaning and docking, a turret housing the vacuum's laser sensor, and a 460ml dustbin concealed beneath a lid. The vacuum has an attractive matte black finish, setting it apart from its mostly glossy competitors.