I have never had a failure of any gigabyte board i have had, although i just bought a gigabyte z68-ap-d3 which is supposed to be 22nm ivybridge compatible out the box, needless to say it wasn`t luckily i had other sandybridge units i could take cpu out of and use it to update the bios.
But i read lots of similar stories online and a lot people did not have a sb chip to put in, i though this as quite poor of gigabyte and ebuyer.