First time build (technically second; see next sentence). I started with a more conservative build (a 4970k and 97-A) and after finishing the wife mentioned she wanted a desktop, so that went to her and I tried out the 99 series motherboard.
Uses will be primarily as a home computer but I wanted to option to do some work from it if need be. Work involves 3D-laser scanning and HDR optic imaging (though I do not plan on working from this desktop much). I used to game a lot but work and family life have severely limited the amount of time I had for gaming fun. I have adjusted my hours a bit and hopefully will have some time to enjoy my newly built computer.
The monitors are old 27' planar PX2710MWs that I used to have at my office. I will upgrade them to 4K monitors to complement the build eventually.
The m2 drive was purchased as a whim on eBay for $5 (plus $4.95 shipping) . The description said that an OS could not be installed on it. It was formatted incorrectly and a simple drive clean and selecting the correct install in BIOs made it work like a charm. I am using it only as a boot drive. The 250 GB Samsung drive was originally going to be the boot drive and the 3 gig WD for storage. The WD Blue was a part from my old desktop that I threw in. If I knew I would wind up with so many drives I probably would have attempted a RAID set up. Things just sort of evolved.
I know I could have built a cheaper build with only very slightly less power but I work hard and opted for the parts and aesthetics I liked. And the last time I got myself was a desktop was back in 2003 and I decided to make up for lost time.
Update 2/13/2015: I added a third GTX 980 and the NVidia 3 way bridge. I replaced the front intake fans with 2 140 mm Noctuas to help to pressure and airflow within the case with the third card added and also got a RoG Swift for a display.