Not like the original manufacturer's replacement
I have read the reviews.  Others must have a different batch than I do or the reviews are bogus. These replacements work well except the shaft rotates in the toothbrush motor unit so they do not remain perpendicular to my teeth when brushing.  So I must hold the brush unit with one finger while brushing.  A little inconvenient.  Brushes seem to last 3 months without losing any bristles.
Rating: 3 stars