Review (2/5): Not as good as the original Sonicare
I purchased this as a replacement for the original Sonicare for my husband and myself. I bought the set with two units and one charger. Even though I like the new brush head and noticed its brushing action is improved with this model, I found that one of the units (the one I use) doesn't hold a charge very long. The old one went two weeks. I am lucky if this one goes a week. Sometimes 4 days is all it stays charged. The unit my husband uses hold a charge for at least 2 weeks just like the older model.
I called customer service and they had me perform some tests and put the phone up by it so she could hear the sounds when doing the tests. She said it was fine as it passed the tests. She advised me to return it to the charger daily if necessary. I explained that my husband's didn't need that frequent charging and she just ignored that fact.
I was considering getting one of the newest models and seeing if they are any better, but might just switch to Oral B, as that is what my dentist uses.