I wonder if these can be set to use frameskip in order to help with the heavier games [RR2 PSP, DOA2 DC] as I don't know if you can access the emulator's settings through one of these things, but that aside, seems pretty cool you got yourself a cheap device with a controller included that can do the trick for retro emulation without having to carry around a laptop or bunch of consoles.
Definitely something way more worth of an investment than those shoddy 100-in-1 game consoles, whether they are bespoke but still crappy weird games...or glorified NES bootlegs [the famous Polystations].
On the note of the thing including a controller, I wonder if you've heard of Marvo branded controllers - I've seen some on a local mall but I'm not sure if you've seen them or if you'd know from others that if they are of good quality.
You can access emulator settings but frameskip doesn't help a whole lot. I'm fine going without PSP though, and most Dreamcast games run fine.
I've never heard of those controllers in particular. Only ones I see at malls nowadays are Xbox knock-offs and PS2 like controllers hahaha