For me, it's all giveth -- that is, my SP3 was quite problematic, with heat issues, locking up all the time, generally unstable, and some software wouldn't even open. I did 2 refreshes and 4 factory resets and nothing fixed it. Since the 9/9 updates, this thing is cool as a cucumber and hasn't locked up once. All software runs as it should and it is problem-free as of now.
When the 9/9 updates came out, I did a full factory reset (again) prior to installing the updates. A couple hours ago, I started the process of synchronizing my 40,000+ files on Google Drive while simultaneously working in Photoshop, WinSCP, various browser tabs and streaming Spotify -- it's been downloading the whole time and it's not even the slightest bit warm. It's in the dock, plugged in, running two external monitors along with the SP3's own screen plus an external USB drive (where Drive is being synchronized).
I'm feeling pretty blessed at this point.