I have now used the toothbrush only 4-5 x, but what stands out is directly the beautiful design. It lies well in the hand and is compared to my old, Oral-B oscillating almost silent! On the teeth after quadrant you have to get used to but possibly only in the long run is that determines very helpful. The teeth feel smooth and well cleaned and you have after brushing a good mouthfeel.
About battery problems I can not say at present, of course, but I hope that with my product is no error or the like exists =) At the moment I speak, therefore, a strong buy recommendation.