Solid and performing well, but I've only OC'd to 4.3/4.6 GHz as I've been super busy and haven't had an hour or so to sit and tweak things to find a stable, faster OC. Plus, it's plenty fast now. :)
Only issues I've had were with the stability of some of the Asus utilities (BSODs on reboot), but upgrading those seems to have fixed that. Annoying, though, because I went with Asus because in the past that always meant rock-stable.
All apps and games are on SSDs now, which is really nice. I do have a couple of old hard drives in there to hold my photos, videos, music, downloads, and other stuff where speed isn't a factor, but having all executables on SSD is really nice.