Instruct: Classify Amazon reviews into positive or negative sentiment
Query: excellent product

overall, this is my 2nd sonicare, and overall i'd say its a fine, excellent product.a couple of notes:1. the brushheads that come standard with this package are very stiff. They make manual toothbrushes with soft heads...i don't see why they can't offer the same with electronic brushes.2. there are a lot of little tiny crevices which can get dirty/clogged fast....which makes cleaning a pain.3. the newer models seem louder than the previous models. The older ones had this pleasant light humming noise,,,,but this model functions with a loud obnoxious buzz(similarly like the oral b's).