they're not too bad. I can recall the Philips brush heads lasting ...

Half way through this pack of 6 and it has become clear. You do get what you pay for. Considering that you can get 6 of these for these than Philips was charging for one brush head, they're not too bad. I can recall the Philips brush heads lasting much longer before an obvious reduction on the vibration of the bristles. Where the vibration in the Philips brush heads was still going strong after 60 days or so, these start to drop of significantly after about two weeks. You'll notice the vibration gets louder under the plastic cap that screws onto the base. The rest of the brush head seems just fine, but you'll have to replace these much more often unless you want a manual electric toothbrush. I'd have probably given one star but you do get 6 of them for $20.

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