Just upgraded my system to Windows 10 last week. For me, a Windows OS is needed for a hobby... Flight Simulator. FS-X runs better on Windows 10 than it did on Windows 7. System is more than capable (24GB RAM, dual video cards, ASUS Sabertooth 990FX MB, AMD 8 core "bulldozer" processor).

Windows 10, so far, seems smooth and efficient. Congrats on the new machine!