Alright, so first things first, this is definitely a gaming BEAST. When I first got into PC building, I had a cheap, 400 euro PC, and just for fun, I bought an unlocked CPU for it (Pentium G3258), to see how that would work. Now, since I OC'd it to a huge 4.23 Ghz, this thing is a bang for its buck (or euro, whatever)
I use this for gaming, like MC (sue me), COD III, Battlefield, CSGO, etc. I'm not saying I can destroy each game with 60fps+, but it stays at a very playable rate. First, I only wanted to build this so that I could record 1080p60 for YouTube, but I quickly realized the capability of this machine, and not just for recording.
For me, there were absolutely no problems, since I had external help from a friend when building this.