EDIT: This is for the OLD PocketGo. Sorry. I misread the above post.
I got one a few weeks back. It's really nothing special compared to the other "Retro Game" handhelds. The buttons are nicer, the D-pad is mediocre. The screen looks very nice, but it is just too small: approx. the size of GBA micro. I would not like to play PS1 games on this tiny screen, even if they ran full speed.
Kinda sucks how it has a different SoC. Most Retro Game consoles have have Ingenic JZ47XX, this thing has Allwinner SoC; that means that games and emulators compiled for RetroGame will have to be rebuilt from source. It isn't super-hard to do but I'm tired of recompiling and messing around with button mappings and SDL_Video_Thisandthat() every time a new one of these el cheapo consoles comes out.
Pretty much everything has been ported, but if you like obscure handhelds/consoles and old games (Nethack, Powder) you're going to have to compile them yourself.
I mostly play handheld games and 8bit retro consoles.
GBA emulation (gpsp) is slow and probably not going to improve. To get almost all the games I like to play working, I have built 3 different versions of gpsp.
I tried a few SNES games and they ran ok, but I'm not a huge fan of that system.
Neogeo color pocket emulation was very slow, even with no scaling. (I don't think this emulator was included by default. I downloaded the source of NGPC and compiled it)
Atari, Coleco, and other super-old consoles ran fine.
There was no emulator for my favorite retro home computer TI99/4A, so I ported dingux-ti99.
All around, I think PocketGo's SoC is a little bit weaker than the Ingenic SoC in Retro Game handhelds.
If you already have LDK or even the old "Retro Game" with the phoney cartridge slot, there's really no compelling reason to buy PocketGo. (Actually, there isn't much reason to upgrade from Retrogame to LDK, but that's another story.) LDK has a bigger screen, is a little faster, and you will spend less time porting stuff from dingux because other people have already done most of it.