Use - I primarily use this computer to edit videos for YouTube, however I couldn't resist gaming on this computer. I like to play a bit of GTA 4, Sims 2 and Trains Simulator. I have recently started playing PS2 games through the PCSX2 emulator (brings back good memories!). I also do an odd bit of 3D CAD work on this machine for my projects in AutoCAD Inventor 2014.
Thoughts - This PC is the most powerful PC I've ever own and it was my first build for under £600, I think it's a decent build, I have had a few problems with the R9 270X flickering but that problem seems to have been fixed now. Another thing that's bugging me is the fact I rushed the whole build, I didn't do research into the various AMD chipsets available thus reducing the amount of expansion on the motherboard- No USB 3.0 header for example and PCIe x16 lane is 2.0 rather than 3.0, saying that PCIe x16 2.0 has enough bandwidth that the GPU won't be bottle necked.
Conclusion - This PC has served me well, it's been my first little steps into the PC building community. However I have learnt a lesson, be patient, plan, research and you'll end up with a PC that will fulfill all of your needs!