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Given that Sonicare has serious reliability issues (you can find this out by reading other reviews), then why buy something more expensive?
This specific Sonicare 2100 has nothing to envy from other more expensive ones; it cleans teeth just as well as other pricier Sonicare models!
Also, compared to the previous Sonicare I had that broke (Protective Clean 4300), the 2100 seems to have a more reinforced rubber around the brush's axis (which was the problem with my previous Sonicare), so logically it should last longer!