It will do for the collection, but otherwise the device is meaningless, for the same or less money you can buy a high-quality Chinese "portable emulator of everything from dandy to ps2", and play not only mario, but also other games from childhood.
Pros
The format is like the old Electronics. You can finally try to pass Mario
Cons
The screen is smaller than that of the "electronics" and is generally quite small, there is no stand at the back, the screen remains constantly on only when charging, otherwise it turns off after a couple of minutes, charging is only by wire, the charging socket is on the side