Here you go:
GBA: faster (was already great on A320), huge sound sync (lag) issue
NES: perfect, but the sound sync (lag) issue
SNES: faster, no transparencies, incompatibility issues
Genesis: biggest sound lag, I reckon not really better than A320 (haven't tried it a lot though, the sound issue is too bad)
NeoGeo: greatly faster (almost full speed, but in some very demanding games), slight sound lag
CPS2: great enhancement, faster, most demanding shooters (for instance Mars Matrix) fully playable, some latest fighting games not playable on dingoo A320 are playable now, but slight sound lag.