This toothbrush lasted me almost ten years!  I was sad when the battery finally gave out.  The sensation was strange at first, but after using it a few times it became addictive.  I could definitely tell the difference between the Sonicare and a regular toothbrush.  The Sonicare makes your mouth feel clean and your teeth feel smooth, almost like you have just been to the dentist's office.  The only thing you have to replace is the toothbrush heads, which should last at least three to six months.  Just keep the unit plugged in on your bathroom counter and use it whenever you need to.  Remember...