ATI and reliable should not be in the same sentence.
My definition of reliability is that a component last without major problems for at least 10 years under normal use.
2 major companies that fail this are Creative and ATI ... and many cheap ones as well, I remember there was a cheap HDD that broke in 2 weeks, and other components you might find say in a Compaq. You get what you pay for ... cheap is cheap.
What are you talking about!? Some guy had his radeon x1900 XTX super cooled under a phase change cooler, but he forgot to switch the cooler on, the core of the video card got hot enough to melt the the plastic bracket holding the evaporator on, the card STILL worked after being expose to 90*C+ temperatures...If thats not reliable, I don't know what is. ATi's lastest GPUs are extremely reliable. They shouldn't be any less reliable then nVidia considering ATi's and nVidia's chips are both made in the same place!
Cheap does not always mean cheap. Alot of companies clear out their excess stock and incase you havent been paying atention to the lastest GPU/CPU news, ATI is locked in a price war with nVidia and AMD is locked in a price war with Intel. What does this mean? The customer wins.