Started with the 600 series. Sure it was silly, but it cleaned well and had no problem other than finding a charging station. I also bought it in a set with Bravo. The site I bought was removed, so my review was destroyed as well. This model has many issues that lower models simply don't suffer from. First, it randomly generates error codes and forces you to factory reset it. This also means that you will have to remap your house. A process that is very tedious and time consuming if you plan to