I have an A330 model, wich is basically the same hardware, it only has the shape similar to PSP. I can tell you one thing: GREAT. It comes with most of emulators, which are good in most cases (M.A.M.E, Genesis, GBA, Neo-Geo, NES, CPS1 & 2). Dingoo has a great battery life, you can watch movies for hours and it will work fine. There are other functions, FM Radio, Voice Recorder, but they are not very useful to me.
You can plug it on your TV set and watch movies or play. On A330 model, there's a wireless joypad that doesn't function on A320.
BUT, you will explore the entire capacity of your Dingoo when you get a flash card and install Dingux on it (yeah, Linux). Then, you be able to emulate PS1 (the emulator is getting better every day) and install lots os programs, lets say that way.
The only complain I have is the size. My hands hurt after an hour playing. But Worth it.
People talk about an A380 model. I confess, I don't know.
Just Take a look at the A330, but be sure you made a good deal.