My confidence in nVidia based products has been severely dented by the 7900GT/GTX charade.
As opposed to trying to solve the problems many are experiencing, nVidia decided to play the finger pointing game at the manufacturers whose response has been mixed from very bad to very good. Either way, even the "good" manufacturers don't seem to be able to completely nail the problem.
I'm actually quite lucky in that my malfunctioning card was easily fixed by a slight increase in the memory speed (as suggested by XFX). Others have not been so lucky and have been through multiple cards.
Even though I've been an ardent nVidia user in the past, I seriously doubt if I'll buy another card based on an nVidia GPU, not because of the fault itself, but the shoddy manner in which it has been supported.
I'm interested to hear other opinions on the matter.