These new brushes arrived very quickly, was impressed. I took two heads and my mother received the other two heads as I ordered two packages. My husband noticed that the brush was not moving, the wand was vibrating and the sound coming from the handle was awful...a horrible, noisy buzz. I contacted Phillips and the "person" on the other end of the line advised that these new brushes in my handle did not sound right because I put the Sonicare up to the speaker on the phone. As a result, this lovely person not only sent us a new handle but two new brushes. I again attempted to use the brushes purchased from Amazon.ca in the new handle.... the sound is the same and no vibration. The new brushes from Philips - e series are a dream!
Therefore, I will collect my Mom's two brushes, which are terribly noisy and do not vibrate along with my two brushes and return to Amazon.ca for a full refund...this is in the works.