Got the Pi2 a few weeks ago and loaded RetroPie on it. I think I want to eventually build a bartop arcade for it, but for now i'm still working some of the kinks out of it and discovering all it can do. It's pretty damn impressive what this little $40 computer can do, that's for sure! The biggest issues I have so far is getting a wireless Xbox controller to work. I mean, I only want to use it for Dreamcast games anyway so it's not a big deal, but I just cannot get it to work correctly. All the usb controllers I have work just fine though after configuring them through RetroArch, it saves the config for each controller and loads said config when the controller is plugged in.
^ Before I could access the terminal remotely via Putty
Trying to scrape meta data for 3000 games...yeah, I eventually gave up on that idea.
I've got a b+ set up with retropie I've been using for a while now. I have a script somewhere for grabing verified sets, unzipping them, and grabbing the most relevant games (eg not japanese, not hacks, not known bad rips, preferring known good when theres an option, prefers US over EU etc).
Have it hooked up to my ps3 controller as well. Just wish it could power more over USB so I didn't have to have a hub just to power a BLE module.