I hadn't heard anything about the Eson2 since it doesn't seem like it's available in the US yet.
Seeing that I'm doing so well with the Eson, I purchased the Eson2 to see if it's better than the Eson.
There seems to be a couple of changes:
(1) There is a much smaller forehead piece.
(2) The diffuser is now washable.
I'm trying it tonight. Hopefully it's as good, if not better than the first Eson.