I am using this right now for gaming and plan to upgrade it occasionally by including and SSD, new graphics card, etc. I have already done some game development for it, and that is what I built it for originally. It has been running like a dream with no slow ups, or crashes. Highly recommend the fully unlocked K series of Intel processors. Top of the line performance.
I plan on purchasing a new modular PSU at some point due to the terrible slew of cables that my current one has. The wattage is great and there are not fluctuations, but it is very messy. But overall the performance is great and I would recommend every component except for the case (terrible cable management) and the PSU (non-modular and too many wires)