Gives a chance to the ROOMBA

Installs easily.
The brush syste'me is not compatible with the original syste'me.
The axis is a small turnover which is good, with a rubber sleeve. It is much simpler but in time ???
Less resistant?
The trouble is the cleaning brushes that are too soft and the hair begin to turn the axis of brushes.
Between the brush and the bearing it has really boring face, almost impossible.
But basically it works, it's quieter, although cleans carpets / rugs.
My engine was grid, so we're on a system that would have to wait another more modern version.
For the price it's not stealing.