By comparison, previously had an Oral-B Triumph Professional Care with SmartGuide and were actually quite happy with it. After 4 years of battery was at the end of its service life. I bought a replacement battery and was able to successfully change (thanks to extensive guides on the web) him. Unfortunately, then the handset has been dropped unhappy and has the metal shaft bent (ie the brush box), which then broke off during straightening; - (((
What's also annoying: The Smart Guide is actually a great thing: In my opinion, a little self-disciplined you during grooming, because you always have the part in mind. Goofy's just the newer hand parts are not compatible with the older SG - including "high-quality" junk, because you have to dispose of the functioning Guide at buying a newer model. Sustainability actually looks different!
Cleaning effect: There is actually nothing wrong, and I personally have the feeling that with the rotating brushes the teeth are easier to clean, as in these TriZone Brush. But who has sensitive Kauleisten, may be better off with the latter. But then there's also a star.