Scott wrote in
:

On Wed, 16 Jan 2019 12:29:53 GMT, DerbyBorn
wrote:

Are all the different models basically the same motor / battery /
drive units with just the odd gimmick and different heads added - or
is there a step change somewhere in the range?

I would say to make sure you get one with a lithium ion battery. Maybe
they all have now, but it is vastly superior to the previous NiMH.


Can we tell?


A problem I have had is wear on the spigot that then lets the whole head
oscilate - losing movement of the actual bristles.