Yeah it's pretty neat, surprisingly great quality when plugging in game systems.
Btw I asked the guy selling the dev kit some questions,
I asked what model Gameboy it was inside, and if it was an Nintendo officially licensed product. Also asked if you could plug in a different controller from the one he's providing.
His response,
"It only plays licensed games so it is licensed hardware. Based on the games it plays, it is a plain old Gameboy. It uses a SNES controller, that plugs into a 25 pin port on the front (Possibly for other things then just a controller?)"
BS. Not licensed hardware. Obviously not a DMG, because you can see it playing a GBA game. And no "generic SNES controller".