a follow on comment...
The non-integrated units such as the Sena or Scala Rider allow for the main unit to be removed and taken inside for charging. The integrated units such as my Nolan require me to take the entire helmet into the house to plug in. Not a big deal but we normally keep our helmets in the garage. Just a bit of inconvenience.
On a second note, the non-integrated units have a bit of the mounting that hangs below the rim of the helmet. Sometimes easily to get knocked around. An integrated unit doesn't have that problem.
