If not overclocking, there shouldn't be any issues with the earlier BIOSes. Any failures at stock would fall into the normal percentile of parts that fail that any manufacturer is subject to.
That said, it's ultimately critical to provide proper cooling for your components regardless of the platform or OEM who produced the parts. I've mentioned that this is even more critical with the Intel X79 Express paltform when overclocking many times already, and will continue to do so.
That said, I personally haven't seen many users reporting failure in person, but a whole bunch claiming to have seen such. I pushed my own GA-X79-UD5 pretty hard, and did not encounter any problems, my CPU didn't die, and my board is fine. I do know of a few other others without any issues too, so again, I see all of this as a non-issue. Any parts that fail at stock will be covered by standard warranties.
Based on the info I have, this problem was only encountered in specific load scenarios, so Gigabyte would have an easy way to tell what caused the problem. Really, with them having gone this far with this, they obviously replicated the problem using other parts, and implemented a fix. That fix, as explained, means that any failures caused by this problem are either do to OC, or improper system cooling.