Two parents frustrated with their current Mac who haven't used Windows since XP wanted something quiet, inconspicuous, fast and built to last, with a budget of $1k. This build was my solution to that, and they've been super pleased with the results.
I used Win7 to re-acquaint them back into the Windows environment for a few months rather than confuse them with 8, and then later quietly upgraded the machine to Win10 in September - as I had hoped, it ended up being a pretty seamless transition.
I absolutely adore the tiny little tower - it's so cute.
Edit: Just wanna clarify that the gutsy motherboard was actually a specific request - and I figured it couldn't hurt, since I did want to future-proof it a little, and providing an unusually strong foundation to an otherwise simpler machine probably wouldn't be a bad thing. But I do admit I probably should have spent the extra money on an SSD instead, though, since I was concerned with longevity, after all.
Edit 2: Thanks for the feedback y'all. It's already been done for a while, but I made some hypothetical adjustments to this build based on what I heard: http://pcpartpicker.com/user/robohipster/saved/rK7NnQ