At the very least the WiFi connection is now stable - first time in months. A high speed connection is also now high speed again with immediate connections where it previously struggled (or did not connect) and no perceptible drops or lags. Brightness control for the display seems to be fixed as well - disconnect power and it dims the correct amount (and vice versa) and auto brightness is not leaving me in the dark. Since things seem to be where I want them for the first time since October, I may turn block future firmware updates unless they are unlocking new features. Each firmware update for SP3 has otherwise been an adventure and the November update killed two devices. So far this looks like they undid the messes and boosted performance to where it was before the various fall fixes....
WiFi connects way faster on boot or wake from sleep and I love the option to disable the Windows key on the bezel. Always would hit it when writing with the pen.
I've install all of the latest updates and, although my WiFi is better, now my screen continues to turn on while my tablet is in my bag. I thought they'd solved this problem last summer. Is anyone else having a similar issue?