I have just bought a new motherboard, a ASRock E350M1/USB3 with and embedded AMD E350 processor. I was mostly interested in trying the embedded GPU and the UEFI firmware (UEFI is simply the name of EFI 2).
According to ASRock's marketing, the main benefit of that UEFI is its graphical interface that allows to use the mouse to configure the board. I cannot agree with that, because I think it is perfectly possible to implement that with a BIOS (and I think some BIOSes actually do it), and it is pointless anyway. For me, the main benefits are a faster and cleaner boot (no idea why it should be faster, but it is).