Review (4/5): I'm pleasantly surprised!
I ordered this product after my dentist suggested it to me. I purchased a new, but already opened box, which concerned me when I saw the condition of the outside of the box. But, the unit itself and all the components were new as described. The battery took about 24 hours to fully charge, and I've been using it ever since. I even took it on a week-long vacation, without the charger and had no trouble with it. The brush worked as well on day 7 as on day 1.
I've only used the Sensitive brush on the sensitive setting and I feel like I'm doing good things for my teeth. I would recommend this product. My dentist specifically liked the feature that would stop the brushing action if I press too hard. I've tested this, but only got it to stop spinning after pressing harder than anyone would in a normal situation. I'm not sure I see much value in this feature, but it is the one that convinced me to buy this model over the others.