Summary: I recently built my system around this board and opted for a powerful PSU to drive it. looks like one of the best PSU's on the market will not work with this board, an Antec HCP-1000 Platinum (modular). How do I know this? I just got my second PSU today in the mail after RMA on the last one and the same issue. Why I disqualified the board as the issue? I had a spare PSU on my shelf, plugged it in, and it fired up. I was even able to install my OS. Just an FYI.
Summary: I had given this five stars until I realized that I cannot use the front panel USB3 ports on my case because this board does not come with a USB3 header, the only USB3 ports are on the back. Now I have to buy a 3rd party adapter to use the USB3 ports on my case. On the bright side, it worked out of the box with my Ivy Bridge-E without having to the use the BIOS Flashback feature.
Summary: Bought this motherboard with an IVB-E i7-4960X processor. You have to flash the BIOS before the motherboard will post with IVB-E. The instructions are online and pretty straightforward. It might be good to note that flashing requires a USB formatted in FAT16/32 to flash the BIOS; this caused some problems for myself.
Summary: My board arrived without the right BIOS for my 4930K. I took a USB stick and put the .cap file on it. I had to re-name mine "P9X79EWS". The manual is not clear on this. Anyway, with the computer powered down but plugged in, put the stick in the crash-free USB port and push the recover button in for a few seconds. If all goes well, after about 5 minutes of a blue-blinking light you will have the right BIOS.
Pros: Lots of PCI-Express slots. Dual Intel LAN. Lots of USB ports on the back. Legacy PS/2 connector. Lots of fan ports. Non-Intel ports seem to have good performance on them.
Cons: Lack of internal USB headers. At this price point there should be 2x as many. If you have internal USB devices you may be short after you hook up the typical MB case headers.
Summary: My old motherboard (ASRock) was giving me some errors so I replaced it with this board. After about a month this board started acting up as well and eventually would not POST. I ordered a replacement board and had the same problem so I took the entire lot to the computer repair shop. They sent the CPU back to Intel, who diagnosed it as faulty and sent a replacement.
Summary: I was also looking at a couple of more expensive ASUS boards and ended up buying this one. It has loads of features, with the (as usual) excellent ASUS bios. It has yet to cause me any trouble. Although it does "only" support two-card SLI/Crossfire, it does have more than enough USB (also 3.0) ports and SATA (6 Gbps) ports, for as many peripherals as you can stand. If you're in the market for an inexpensive 2011 board, check this one out. It will not disappoint.