I have had good luck with BIOS updates of other Intel boards but I must say that the August release of the DP67DE BIOS made problems. Before the update, aside from the unit restarting after it was powered off (unless I held down the power button) the system was pretty stable. Now that I applied the BIOS update, it locks up if it goes into sleep mode. It will lock up 50% of the time that it boots up shortly before it loads into Windows. I have made no hardware changes-- these problems manisfested immediatly after the update (I had to restart the computer 4 times to get a succesful boot). I tried rolling it back but the older BIOS update is blacklisted, so it seems until I can pray for a fixed update I will have problems.
I like Intel products so I don't want to scare people away but DO NOT update your boardwith the 70 series release for the DP67DE.