Fantastic feeling!
A very effective replacement for hand-brushing.  It really works!  I have not been required to replace battery or brush yet, but I would consider that these are normal maintenance items.  It is a very convenient tool, and I will probably use rechargeable batteries eventually. I can just throw it into my travel bag oand go.  No base station or charger, no cords, etc.  I like that, too.
Rating: 5 stars