Brush heads are fragile; break after about a month.
Owned the toothbrush since January 2015.  It works well, however, the part of the head that holds it to the toothbrush body is very fragile.  I've broken four heads in six months.  When it breaks, the head suddenly comes loose from the body and no longer holds itself in place.  If you look at the base of the brush head, you will see that the plastic spring clamp as broken off - it's about half the length of a toothpick, and about the same size.<br /><br />While it seems to do well (my dentist hasn't said that anything looks different! +1), it's disappointing that the heads are so poorly made.  It's still cheaper than other options, but with a head having an expected life of about a month, you need to plan to buy (many?) more than you expect.
Rating: 3 stars