This was a replacement handle for my electric toothbrushe. I never dreamed I would have to purchase another handle as these items appear to be very well built. Seems like there is a weakness in the upper portion of the unit, that can be replaced separately, even when the battery portion is still very functional. Bad design, as far as I'm concerned. For the initial price paid, I expected these units to last longer and be of better quality.
Also, your questions above need another answer, other than YES or NO as the item hasn't been in use long enough to make a judgement call as to it's durability