Many of these console in a joystick systems have been hacked into full systems.

I've seen the Megadrive, NES, Atari 2600 and C64 ones converted. One of the Megadrive ones was even made to accept original carts! But these days I think a memory card is the much better way to go.

I've yet to see a hacked one that retains the original all in one joystick design. I would love to see one where it looks original but with a SDcard slot to load more games. That would be very cool.

BTW, what ever happened to the Amiga joystick? It was mentioned a couple of years ago, but then I didn't hear any more? Where some Amiga games released? I remember being disappointed to find out the Sensi Soccer one was the Megadrive port.