is an important one. That Asus and other netbook brands have been flooding the market and constitute a greater number of new machines....meaning they've had less time to break....is significant. I would put more stock in longer term histories of reliability, attrition rates, etc. I have been happy with the Asus motherboards I've put in my own machines over the years...nary a failure yet...and considered an Asus netbook for the one we bought but went with Lenovo for other reasons.
These numbers are for quality not for support ranking once the product has issues.
http://www.itworld.com/hardware/65074/macs-plummet-rescuecom-reliability-ranking

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