I won't upgrade. I tried it on my old laptop, it ran worse and started crashing randomly, revert to windows 7 seemed to work but problems persisted, 2 reset to factory settings later (first failed to re-patch windows 7) it is sorta stable again.
From what I saw of it, I don't see any point in upgrading. I'll need a new laptop first to take advantage of DX12 and will get stuck with win 10 eventually :/