On a trip from WA back to BC, we called the Bellevue SC on zero notice and asked if we could come by for 5.9. They said "sure!", so we did. They did insist on actually installing it, for safety's sake, so we were there about an hour, but worth it!
A few observations, hopefully some of them new:
1) The transition from "Standard" height to "Very High" (which we use all the time for the ferries, etc.) now seems to be about
twice the speed as before. I have not measured it, but if someone still with 5.8 want to get a timing, I will too. Very welcome change, if I am not imagining it!
2) Love all the UI tweaks, even the subtle ones on the instrument screen. It just all looks more polished now.
3) Browser is now finally reasonably usable, as others have noted.
4) They seem to have fixed the charge current gymnastics of 5.8.x. When I plugged in to my HPWC at home, set to 60A, the car ramped slowly up to 30A, held there for may 30 s or 1 m, then ramped up to 60A. It seems it is trying the 'safe' level first, then going higher, just as the Superchargers do. I plugged in my Roadster at 40A simultaneously, and my power monitor showed a significant voltage drop, but no back down by the Model S. Here is the power monitor trace (Model S still charging at the end; bright red is voltage; dark red is Model S; yellow is Roadster; green is rest of house, mostly heat pump). BTW, yes we are blessed with 400A service and a private, new transformer so all this load is no problem.
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Oh, BTW, it was the .94 flavour we got.