Near perfect This works great. I get my ROMs from coolrom and they work fine. With testing  I cannot use the PAL version crazy taxi 1 when I select 60Hz or 50Hz but crazy taxi worked on older versions. Soul caliber also has some graphic issues  but nothing to make it unplayable. And shenmue 1 disk 1 worked fine  but then the game could not find my save  even though it was still on the memory card when I booted the bios. Also  Sonic Adventure 1 has widescreen issues on the nexus 2012  i don't know about other games. The cdi format seems to work fine  i don't know why you discourage it. It is super simple to setup  I was able to figure it out without even looking it up. That's all I found so far using a Google nexus 7 2012. Using a galaxy tab s 8.4  Sonic Adventure worked fine  even in widescreen mode. I have not tested any other game.
February 19 2015