Oral-B Vitality Electric Toothbrush Review

the braun sonic toothbrush is one I picked up on sale at Target after lookig at the pricing through out the area,  we lost two other electric tooth brushes, one for traveling one for home almost at the same time.  The original price of 75 dollars was not something I felt comfortable with, but the sale of 49 was in my budget, despite some of the internet reviews (head falls off for example) I am very happy with the cleaning power and stability of the handle and brush, I always wonder though,  why are the little heads so expensive compared to a manual?  We travel with this one and I miss it when I have to leave it behind for my husband, I have only had it for 3 months and am interested in the dentists opiniun once I go for my cleaning, I feel like it cleans better and keeps my teeth cleaner longer. I always look for the sale prices,  have too these days