Topic: WS90 , how many versions of this array exist?

[Rover1822]

I'm asking this based on data and calibrations info posted by others and my own experience with 2 units.
We know there was a Beta version that some got.
We know there was a version , that we call the Kickstarter version , which was released after changes were made to the Beta. Changes that required a delay in the delivery of the Kickstarter version.
Now, is there a version , that has changed from the Kickstarter? , I believe the version being shipped now is different. Sadly , there is no way to tell by looking at the units, and what they are.

So if anyone know conclusively, are there in effect, 3 versions ?