Stiff at first but work fine
These attach normally and work fine.<br /><br />The one think I'll note is that the bristles on the one head that I've tried so far were very stiff originally, to the point that they made my gums sore. But either my gums toughened up or the bristles loosened up, because now everything is fine.<br /><br />Definitely worth the savings over the name brand.
Rating: 4 stars