Very good results at premium price

I am very pleased with the 9900. The cleaning results are very good, and the "Smart Guide" provides at the beginning a good orientation. Whether the display must be unconditional, I leave undecided times; but the acoustic signal every 30 seconds and two minutes is quite helpful for self-control.

There are two smaller improvements: The base station could be better designed. The accommodating the brush might be easier, the handset sits quite loosely in the station. In addition, either the battery capacity greater than or charging could be shorter. We use the unit for two (ie four times cleaning per day) and so must every three days Charging twelve hours.