Review (4/5): excellent, effective brush, but louder than before
My old, original Sonicare brush died, and since I had such good luck and success with the toothbrush in the past, I got the e5500 as my replacement.
Compared to the original Sonicare, the e5500 has some nice improvements: easier to clean charging base, smaller brush-head and slimmer, easier to grip handle. The toothbrush cleans very effectively and I have no reservations in recommending this brush to anyone.
My only complaint is that I believe the brush is louder than previous models. Not loud like living by the airport or anything, but loud enough to notice a difference.