I received my console a few days ago. Generally, it makes a good impression. The buttons work well. Very good quality display. Game emulation is very good as long as the game works. My console has improved screen proportions for gameboy games.. I tested some games and the following titles did not work/was glitched for me:
Battletoads NES (USA/EU) not working... (Japanese version works

)
Battletoads Double Dragon not working
Castlevania 3 (US/EU/JP) has broken sound
Big Nose Freaks Out NES is glitched
Unlicensed Bio hazard NES is not detected by the console
Prehistoryk GB (US/EU/JP) not working
Trip World GB has glitched intro but playable
Shantae GB is glitched too but playable
The improved aspect ratio mode is useless because the image is very small.