The brush head is optimal in terms of size for me, and is very quiet and cleans really satisfactory. My teeth feel now very smooth.
From the optics, the part does very well in my bathroom, because black is beautiful. And the handpiece is really very chic.
The battery is -for me- perfect because he holds min. A week. What do I want more?
These were my personal experience with this toothbrush and so I can say a very strong buy recommendation!