I have to say that the S4 MAX has really surpassed everything I've seen. The virtual walls and no motion feature are perfect for my needs. It creates a perfect map the first time you run it. I can ask to clean the whole house or a specific room via the app or by voice via Siri. He rarely bumps into objects and gets stuck under them. And he has no problem stepping onto our thick carpets and sucking them up. He was able to clean my whole house and still had enough battery left and had no problem finding a charging station. If you are looking for a really smart bot. To basically automate your daily house cleaning, I highly recommend you try this robot vacuum cleaner!