I don't really use it for much. I play video games and browse the web on it. My last PC was adequate but was feeling its age since I wasn't able to get 60fps with everything maxxed out in Ryse. Last PC was a Core Duo Q9650 with 8gb ram at 128gb SSD and 2tb HDD mated with a R9 270x with a 15% OC. So I had some extra cash and decided to build a new computer that I won't have to update for at least two years.
The only problems I ran into were with the Cosmos SE case itself.
1) I wanted to front mount the Kraken in Push/Pull config however the front dust cover wouldn't fit unless I found some slim fans. So I abandoned that idea and have just a static pull with the stock NZXT fans.
2) since I had an SSD that I mounted on the opposite side of the case (where you do wire management) and I only a had a single other hard drive and was never going to use any form of optical drive with this case I figured I could easily install the bottom hard drive cage into the spot reserved for the ODD. Well it wasn't quite that easy. I eventually found a way to get it in that allowed me to utilize the included trays for the standard HDD and didn't clutter the case. As an added bonus I could still use the second slide out tray if I ever needed too (providing I ran a 3rd SATA data cable). Pictures included.
3) Upon booting up and playing a few games that rendered the games at 4k and downscaled to 1080p, the GPU's got hot. I opted for the reference NVIDIA GTX 970's from BestBuy.com because, well, the cooler design looks awesome. Anyways, while I was thinking of ways to optimize airflow I decided that, since my CPU is waterchilled and my GPU's are venting heat out the back, I could remove the rear exhaust fan and place it as an intake near the front mounted rad. And since the frount mounted rad wasn't really heating up since I was doing a very mild OC (3.5ghz to 4ghz), I could rely on the rad fans to simply constantly spin at full speed and not worry. So basically I set up every single fan in the case to intake with the only exhaust fans being my GPU's. I then mounted a 120mm fan directly in front of the GPU's blowing air from the nearby twin NZXT's from the front. Pics included. In order to mount the fan to blow over the GPU's I needed to use the stock HDD mounting brackets, unfortunately I had heard people complain about how restrictive they are for airflow and looking at them you can tell that there might be truth to that. So I had to hack them a bit, the results aren't pretty. Pics are relevent.
4) Didn't have to do with the case but more with my failure to properly research the parts I was going to use. So I found I couldn't OC as much as I had hoped since the MOBO I use seems to not allow you to manually modify the OC settings. I had to use the "OC Genie" which gave me around a 14% OC. I am not really complaining as this CPU is already faster than my last one by a longshot.
Also, I used 3dMark 11 Demo to benchmark my system after I OC'ed my GTX's. The results were: 14773 http://www.3dmark.com/fs/3641154
I think I might have to adjust my OC's but I really don't care that much because this is more than I was hoping for :-)