Conclusion and verdict
The ECOVACS WINBOT MINI works best as a maintenance robot, not a rescue robot. If you want cleaner indoor glass with less effort, value a compact body, and plan to use it regularly enough that dirt never gets out of hand, it is a sensible mid-priced entry into robotic window cleaning. Check the current offer, because its value improves a lot when it sits comfortably below larger premium models.
If your windows are often heavily soiled, mostly divided into small sections, or you expect dramatic time savings on every job, this is not the clearest fit. The better route in that case is a more clearly heavy-duty window robot or simply sticking with manual cleaning for occasional deep work, because the WINBOT MINI earns its place through convenience and upkeep, not brute-force cleaning.