Usually when A) I have a problem or B) when I do a full reinstall
i update my motherboard when ever a bios update is released.
Running my UD5 on the shipping bios F7 and never had any of the problems that other people have.
Samei update my motherboard when ever a bios update is released.
I do and have done so for many years. For the most part they have been virtually pointless, but some things have to be done.That said the last update I did to my current Asus M4A88TD-M EVO/USB3 made the SATA 3 come alive, so to speak. This was easily the most useful thing to happen from any of my BIOS updates, ever.
Only one 'flash' has ever gone pear shaped, which was in the last few weeks oddly enough.
Never done one. I'm currently using a Gigabyte 890GPA-UD3H, and the BIOS it came with seems to do me fine, not planning on doing anything with it because I've seen a few forum threads about how dodgy the BIOS releases have been for this bored.