Never turn my PC off, regardless of OS. (Edit. under normal day to day operation. I only technically turn my PC off and unplug it on the rare occasions where I have to travel and be away from home for more than a couple days, and I turn off and unplug most my expensive electronics when I do so, partly as fire prevention partly to just protect them)

Introduces to much thermal and electrical stress for my taste, and most assuredly shortens life span of the system/components from my personal experience.