It is the time killer because I will be killing a large amount of my time on it playing games. I built this PC to replace my 6-7 year old computer. The build went really smoothly and I am happy with it. The cable management was pretty challenging since the PSU isn't modular and there isn't a lot of space on the back of the case. I gave it a little effort, but didn't spend too much time on it.
CPU: Fast. Beast of a processor. Haven't messed with overclocking yet, but I will get around to it sometime.
CPU Cooler: Keeps things cool and quiet. Haven't put it through much stress yet, though.
Motherboard: Was actually going to get a G43 or the Gigabyte equivalent, but I bought I bought the CPU/mobo/GPU/PSU on a 20% off deal at staples and staples was out of these other two motherboards. So I went with the G41.
Memory: It's memory; what can I say? No complaints.
Storage: SSD: Love it. Windows boots so fast. I may be buying more of these when the price drops some more, and do away with HDD altogether. HDD: It was a cheap 1TB HDD. Probably should've spent the extra $20 to get a WD. This Hitachi one is quite noisy when reading/writing. That's what I get for being cheap.
Video Card: Haven't put this to the test yet. I look forward to putting it to the test.
Case: Decent case for cheap. Fit everything in there with ease, has room for more fans, and has front panel USB 3.0. It could use some more space for cable management, but it isn't terrible.
PSU: Good so far. It isn't modular, which made cable management challenge.
Monitor: It was around the same size as my last monitor and was 1080p LED, so I got it. I didn't care for IPS, which helps with the price a bit. It is a significant upgrade over my previous monitor, as you can see in the picture.
The rest of the stuff were cheapo parts i added out of necessity/convenience.