I recently rediscovered PC gaming and was getting frustrated by the performance limitations of my previous PC (a 4 year old off the shelf PC with various upgrades), so I decided to build myself a new gaming PC that could handle pretty much anything current and for the near-ish future at 1920x1200 at highest settings.
It was a different world working with high quality components - my previous PCs have all had serious cost compromises (I was the guy who bought a Cyrix and a PowerVR GPU).
It took a little under two hours in total to put it together and the system booted first time (once I'd flicked the switch on the PSU - doh!). An hour later and I had Windows and Steam installed. I have forgotten to connect the SATA cable from the ODD but that can wait.
I'd expected this case to be harder to work with - even the PSU (150mm long) wasn't too much of a tight fit and hopefully my cable management isn't too horrible.
One thing that is definitely clear - I couldn't have done it this well first time around without the advice and information on here - just being able to see pictures of the case/GPU combination and know it would fit fine was a massive reassurance.
Edit: Adjusted temperatures. A CPU idle temp of 3 degrees over ambient can't be bad. Also I thought I'd give a bit more detail about my choice of motherboard. Yep, it's got a yellow colour scheme but it's inside a non-windowed case so that doesn't matter. However when searching I couldn't see any other Z87 mITX boards with more than one system fan header - this has three, plus 6 USB3 ports compared to 4 on many other boards.
The parts marked with a price of £0 were in my previous PC - I saw no need to upgrade them to newer hardware.
Edit 2, May 2014: Since completing this build I have upgraded the SSD to a Samsung 840 EVO 240Gb, the 120Gb drive is going into my wife's PC.