Retroarch 3DS is still a big mess as of the latest nightlies. gpSP is still unusable due to the crashing, Nestopia is completely broken, and gambatte's sound is bugged. The SNES, NeoGeo, Genesis, and the other NES emulators are working well at least, but it's a real shame that the devs just decided to disappear again.
Unfortunately that's true and you can add one thing to that list: Gambatte crashes very often if loading save states in the latest nightlies...