Built for a cousin who wanted something for casual gaming and school. Didn't get a chance to run tests, and wasn't going to OC someone else's rig, but it was still a fun build.
First time working with a fully modular PSU. I highly recommend it! Makes cable management so easy with half of the extra cables removed, and easy to replace down the road if needed.
The CPU cooler was hard to put together due to being made for any CPU size. Had to screw in the mounting brackets to match the size needed, and one of the screws would just not go in straight, and it was just very frustrating to assemble.
Surprised at size of the 200-mm fans on the HAF-922, and I bought an extra red LED case fan for the side window. Looks pretty sweet, not too loud, and blasts air like crazy.
Had some issues with drivers for the mobo; not even Ethernet would work after Windows install (luckily ASUS has a good support site). After drivers were installed, cousin was excited (and so am I!) at having built-in wi-fi with a desktop. Also, the antenna with the Z87 is magnetic, so works great with a steel case, won't ever fall off while carrying.
All-in-all, great parts (oh, and I went with 2TB Barracuda since it was on sale for only 20$ more than the 1TB through Amazon) and a joy to put together, only took about 2 hours after unpacking it all and POSTed on first attempt! :-P