I have found them to be just as good as the original toothbrush heads that came with my ...
Although some of the other reviewers indicated that the bristles didn't last, I have found them to be just as good as the original toothbrush heads that came with my Phillips Sonicare toothbrush.  The package even has the very same number (P-HX-6064) that's on the Phillips replacement brush heads that sell for $25.00 for two.  I love my Phillips toothbrush, but when I bought it...for nearly $200.00, I had no idea that I would have to spend an additional fortune on the brush heads.  I was delighted to find these replacements, and they have worked beautifully.  If you change your brush head every three months, as your dentist recommends, these will last 5 years.  Truth be known, I've gone a bit over three months, and my brush has shown little wear.  This is an excellent buy!
Rating: 5 stars