I can only speak for Wii emulation, it works great.

OLED deck have excellent Bluetooth compatibility with WiiMotes, I can hook up 4 of them using emulated bluetooth mode. (Can’t get passthru mode working tho)

Some configuration beforehand such as changing all four controller slots into “real WiiMote” & enable continues scanning is all you need to do.

Just a side note. Switching between handheld and docked mode is a dull process. In order to switch input source you have to go to desktop mode every time.