I installed my new 2600k today. A few quick thoughts:
1. Asus has a GUI BIOS that I found more than a little annoying. Award and Phoenix have been the same for years and there's no reason to show me moronic little gauges.
2. The 2600k has a tiny, weak fan and average temperatures on my 2600k are higher than I'd like, idling at around 44C without me screwing around with anything. It's also insultingly loud, meaning that I can hear it. This must be fixed.
3. Really, Asus? None of the included drivers will run their Setup.exe under Server 2008R2, so I got to load them all through Device Manager. The Intel Ethernet Adapter and Serial port (yes, serial port) still won't install.
4. Plus sides: Clear CMOS on the rear panel and hard buttons for Power On and Clear CMOS on the inside, Comprehensive manuals, little 3.5" drive with a couple USB3 ports on it.