I have the Asus Rampage III Formula motherboard and I love it. But as far as their customer service goes, it's virtually non-existent. With the exception of their notebook support, Asus support/customer service sucks just as bad as all the rest of the company's out there with the possible exception of EVGA.
I'm not writing this to trash Asus. I like their products. I also own other Asus products: A notebook, a netbook, 3-24in LCD monitors, an OverClocking station, 2-DVD burners and a BluRay burner. So while some might say I'm an Asus fanboy, I'm also in a position to know that Asus MB support sucks at least as hard as most of the rest of the MB manufacturers (but I guess a fanboy wouldn't say that).
A few examples (from personal experience) of their fantastic MB support: Asus advertises their Rampage III Formula as "Maximum Memory Supported 24GB" But then they don't support it in anyway that I can see!
There is no RAM or even combination's of RAM that equal 24GB listed in their QVL (Qualified Venders List) and if you call Asus technical support because you are having problems with the way your MB is acting, if your ram is not in the QVL they will not help!
When I called support to ask whether additional add-on cards in the in the PCIe x1 slots would have any affect on my two video cards in CrossFire in the PCIe x16 slots, I was told I would receive a callback within 2 days. REALLY 2 DAYS to get an answer to a simple question?
Well technical support never even called back, so a week later I called again and (again) was told they would call back within 2 days. When I plead my case that I called a week ago and still hadn't received a call back and I only had a simple question anyway, she (the Asus employee on the phone) asked me what the question was then as an answer told me that installing a add-on card (in this case a sound card) into any of the other PCIe slots including the x1 slots would bring the 2 x16 slots that my video cards were in down to x8.
I have since found out (with no help from Asus) that filling the PCIe x1 slots has no effect on the PCIe x16 slots what so ever.
I now have a PCIe x1 sound card, a PCIe x1 USB 3.0 card for 2 additional USB 3.0 internal ports for the front panel on my case as well as 2-video cards in the PCIe x16 slots with both video cards running at x16 NOT x8.
The point is that not only did I not receive any help from Asus tech support/customer service with my motherboard's configuration (ram and PCIe) but the only Asus employee I was able to speak to when I called tech support gave me the wrong answer! So if you want a great motherboard, go ahead and buy an Asus. Just don't do it for the support/customer service, it barely exists!
P.S. before anyone chimes in and says something stupid like "did you read the manual". I did. The manual covers the effects that the PCIe x16 slots have on one another NOT the effects that the PCIe x1 slots may or may not have on the PCIe x16 slots.