Hi All
I have just received my white Era 100 to use in my bedroom as a single speaker. Here are my thoughts:
The look of the speaker - nice looking although I actually prefer the outgoing One (I have 2 sets of them). The metal grille of the older speaker looks more premium in my opinion. The 100 is still nice mind you.
The set up - very easy as I have excellent WiFi in my home. Did not affect my SonosNet speakers in any way. My app now also reflects the WiFi signal feature on this and my portable speakers which is nice.
The sound - definitely an improvement on the Ones but not as bigger difference as I thought it would be. Just goes to show how good the Ones are! I would not recommend anyone replaces their Ones, but if buying this size speaker for the first time, then get the 100. Mainly due to the added connections (Bluetooth and line in).
Hope this is of use