Hello I bought this toothbrush as a replacement for the old one, which unfortunately suddenly broke. It is exactly the same product. I notice that the new toothbrush does not clean as well and as powerfully as the old one, the motor seems to be weaker. The discolouration on my teeth is hardly removed with the new Sonicare. Since using the new product, my teeth are also not as white as before. I'm still using the same brush heads, so that can't be the problem. I don't know whether my new Sonicare is faulty or whether it has simply been produced differently (with a lower performance). So I also don't know whether this is a warranty case. Incidentally, I was really very satisfied with the old product, which is why I bought the same one again. Thank you in advance for your feedback :-)