The 3 buttons on the right of the vario don’t do anything. I thought this might have been by design, but they work correctly in the Stemme.
While we’re at it…
The PFD “Mode” knob (on the top right) switches through what appear to be a bunch of debug/test screens.
The FCU Power switch (Little toggle on the top of the top left round-dial) is very inconsistent. Just turn it on and off a few times - the instrument power will get out of sync with the switch. It can get stuck on or off regardless of the switch position. Toggling the switch a few more times will clear it up.