The down side is the weight / weight distribution of the machine. Perhaps it is the bigger battery size for longer use of vaccum but the weight is definitely heavier than prior models. 

There are a lot of good things to say about the machine. Start with the machine power. I have both carpets and wooden floor in my house, and the machine identifies the floor type and vacuum everything smoothly. 

Second, because of the heavier battery size, the machine functions longer. I can vacuum the entire house a few times prior recharging. 

Third, the HEPA filter is awesome addition to the vacuum.



Neutral, I am not a scientist so the data presenting at the end of the each vacuum is so-so to me.

The quality of the machine is ok—not the best but not the worst comparing to previous models.