Hey
Very good. Supports SLI and Crossfire and is very easy to use and overclock. If you are overclocking and you made a big mistake that prevents the system from booting, then it will reset to its default settings and you just try again.
I can run my UD4P with BCLK 205 x 20 and with turbo enabled, that is 205 x21 = 4.3 GHz while gaming. If you even have a D0 stepping I would think you can do better than that. Just make sure to update to the latest BIOS version, which is currently F9b or from the official site its F8 I think is the latest without checking. The reason being the new chips are supported in the latest BIOS version if you have that.
The only problem I have with my motherboard is the time it takes to boot. For some odd reason the motherboard sometimes reboots when you first power it on. It is not that big a problem if you know that it is supposed to do this - but scared me a bit at first untill I read that everybody gets that too.
Overclocking can be done using a Scythe Mugen 2 like I have. I am very pleased with that CPU cooler, but there are better ones out there, like the Prolimatech Megahalems, Thermalright IFX14 INTEL, Thermalright Ultra-120 eXtreme-1366-RT, ThermoLab BARAM, Noctua NH-U12P SE1366. All these are better but costs more than twice the money. I would say Scythe Mugen 2 is among the 7-8 best CPU coolers out there and it is very cheap ($37 on Newegg) considering its performance. The difference in cooling would be like 2-4 degrees from the best to the Scythe Mugen 2, which means that yout room temperature is just as important. Just make sure you have enough room in your case and that your memory will fit because it hangs over the first slot, but if you use some "normal height" memory like me, that will not be a problem.
205 x 21 = 4.3 GHz