Hi there, I've bought several Asus products including my Asus HD 7770 which I have right now and I can tell you Asus is a real good brand. They do have longer longevity due to an improved heatsink compared to the reference cards anyways most of their cards even state around 20% cooler operation and longer lifespan.
Take a look at the link below and when you read the part that says Direct CU they claim it will run cooler:http://www.asus.com/Graphics_Cards/AMD_Series/HD7770DC1GD5/
I would say Asus is a very good brand for all computer parts. There are also other brands that perform just as good if not better on certain video cards.