Hi !
Though I’d share my experience with the RPI 2.
First I’m a total newbie to raspberrys and linux, in fact I just heard about the RPI 2 when it came out and was very interested in it then learned about Retropie. and I came up with a project of building a retro arcade cofee table.
I installed retropie from raspbian using the retropie script, it works great !
Every emulator works but some roms won’t dont know why yet.
For example Super Mario works fine on N64, but I can’t get Mario Kart to work (I can watch the intro but can’t play).
Or some roms still have audio issues, even after updating the N64 emulator from source on the retropie setup.
The best working emulator after my tests was the PSX, I tried many roms, most of them worked fine at normal speed without any image or audio bugs. I was pretty surprised seeing that coming out of the RPI 2