We have not put four stars because we have to acquire it and that we should not prejudice the future. From first impressions, the robot honorably fulfilled his office, climbing the walls and plunging without hesitation in the diamond point of the pool. The cleaning cycle is long enough, about 3:00. The robot is quite heavy, the carriage can be useful if you do not have to cross levels. Otherwise, the robot can be used without the carriage. The filter cleaning (canvas bag) was tiring until we find the solution: We hang with clothespins in a wheelbarrow placed vertically against a wall before passing the water jet. Like many users, whom we relied, we recommend the purchase.