Just to add my little bit to this, I am running both a GA-990FXA-UD5 with the Award BIOS and a GA-Z68X-UD3P-B3 Intel system with the UEFI AMI BIOS and although I wanted UEFI on the AMD System I have to say from my own experiences I'm pleased it still has the Award BIOS.
The AMI BIOS that Gigabyte is using on the Intel side of things is still very new to them and I don't know if it is due to the way the BIOS is written or due to the Intel chipsets but I suffer continually with cold boot issues, unable to use some devices if others are running, reboots where I am told that the system has failed due to overclocking, only to find that once it has gone through 5 - 10 minutes of POST/BOOT looping that all BIOS settings are the same as when the supposed problem occurred, occasional audio issues with the onboard sound chip and various other niggles that have still to be resolved.
Don't get hung up on UEFI it ain't all it's cracked up to be..... yet. Hopefully, by the time it comes to the AMD platform it will be a little better
Yep, I currently have a GA-770TA-UD3 and am happy with Award BIOS for now. It is stable and has served me well. But because I need IOMMU support, I will be upgrading to a motherboard with the 990 FX chipset. And since this will be an upgrade that I hope will remain in service for multiple years, I'd like to have, at least as an option, the ability to use UEFI, which is available on nearly every competing motherboard. My reasons for wanting UEFI are outlined below.
Any particular reason you want the nice looking EFI interface ?! 
Do you miss it while using the PC under the installed OS ?! I don t.
The normal interface gets the job done with no problems.
The short answer to your question is that I'm upgrading and so want/expect the latest and greatest. That said, UEFI offers more than just a pretty face. Being more modular, developers can (within hardware limitations) offer more features than in BIOS. To name but one example that may seem trivial to you (but isn't to me), most of the UEFI versions that I've reviewed offer considerable granularity over fan speed controls. Beyond that, UEFI offers a number of additional features, including the option for "secure boot" that, although I don't use now, may be useful in the future. I'm told that UEFI boots more quickly. And I'm told that some versions of UEFI (though maybe not GigaByte's version) offer some interesting options for remotely managing systems equipped with UEFI without booting into Windows or any other OS.
I've been happy with my GA-770TA-UD3, and I hope to upgrade to a GA-990FXA-UD5. But if for about the same price I can get a comparable Asus with UEFI, which represents the first real change from BIOS in over 20 years, then I'm a little reluctant to invest in hardware that won't support the latest and greatest.
UPDATE: I notice that Gigabyte will be offering UEFI on their new
GA-F2A85X-UP4 motherboard, which uses the AMD FM2 socket. So Gigabyte is at least offering UEFI for some AMD boards. But I want an AM3+ board, so UEFI on the GA-F2A85X-UP4 isn't of any help to me.
