ASUS has good motherboard/components with a wide variety BUT they have REALLY REALLY BAD customer support in the last several years, so pray that you don't get a bad mobo or have something breaks. I have used ASUS components (2 mobos, monitor, etc) for a while now, it's great if it doesn't break but if it does good luck the RMAs. Most recently, my M4A79XTD EVO died after 1 year of use, RMAed and was sent a bad mobo with 2 bad memory slot; special RMAed that (which is where they send to the replacement while your package is in transit) and got another bad mobo with BIOS problem and one bad memory slot. In addition, the replacement was not sent in a timely manner (while "in-transit") even though a called TWICE with my tracking number. Essentially they sent you other "fixed board" as a replacement but it not as fixed as they though. I'm about RMA again but I don't know how lucky i'll be and get one that isn't broken.
My Gigebyte mobo and video card (radeon 4850) (in another PC i built for my parents) hasn't broke (after 4 years for the mobo and 3 for the video card) so I can't really comment on their support.
Since the last fiasco with my Transformer Prime table and the RMA troubles lately, I decided to stay away from ASUS from now on (the sad thing is they used to be a lot better with it).