Almost five stars
I have been using this toothbrush daily for almost three months.  I have not had any of the problems (e.g. leaking battery compartment) noted by some other reviews.  It is important to smear a little petroleum jelly (Vaseline) or similar substance on the o-ring that seals the battery compartment.  This should be done each time the battery compartment is opened.  It helps the o-ring seal and keeps it flexible.  Otherwise, it's pretty simple to avoid getting that area wet to start with.  The only reason I did not rate this a 5-star is that it does not have the tone that goes off every thirty seconds during the two-minute brush cycle.  I miss that feature from my dead re-chargeable model.
Rating: 4 stars