Wow, my SP4 is utterly atrocious on 14342. Blue screens, brightness issues, trackpad issues, sleep issues, pretty much everything is just terrible. I just do not understand how we all can have such different experiences--yes, I know, different software installed and all of that, but even so, these are such basic issues that "different installed software" just doesn't account for it all.
Worst so far: I shut down my SP4 and stuck it in a bag. Got to where I was going and it was burning hot. Didn't sleep or hibernate, literally shut it down. I suppose I'll restore back to production, but man, what are the chances that they resolve so many issues by the time the Anniversary Update rolls around?