All Crap.
Remember that adage, "You get what you pay for"? Someone didn't tell the current retro gaming racket, and now it's getting to the point where it's unavoidable.
Many, many forums will have small discussions about this but with my experiences with these aftermarket AC adapters, every one of them is terrible. It doesn't matter if you get an off-brand or a high-priced brand, the adapter looks the same, performs the same- poorly, and probably made in the same factory!
Three years ago, I went to a Radio Shack and bought a well made AC adapter for my 6 switch VCS. No interference, great, stable DC current.
This month, I purchased a like-new Genesis Model 1 - everything original, except the power supply. No big deal, right? I can get an aftermarket and be done. Oh, how I wish I would've taken the hit and bought a real, used AC adapter!
First adapter promised " high performance " and was compatible with the SNES as well. Result? The video signal crawled with interference fuzz. Next!
Second adapter was a "Tomee". Promised nothing. Delivered a buzzing audio signal, rainbows for greys, and the wall wart could double as a space heater. This one actually scared me. Next!
Original SEGA Model 1 adapter: Perfect. No interference, no buzzing, no " rainbow effect " on the greys.
Wait- so the old, aging adapters are still better than brand new aftermarket parts? Why? Shouldn't all adapters pass safety and quality tests? I shouldn't have to pay over $50 to get a working wall wart.