So my Hyperkin Premium Genesis controller came in:
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This thing is great! Played through Gunstar Heroes this morning, and it performed excellent, no problems with diagonal shooting, and the buttons are very responsive. They're a bit "clicker" than the Genesis 6-Button OEM controller, and the plastic feels a bit cheaper, but otherwise it's a great alternative, and will be my go to controller considering my old Sega 6-button is broken!
I can second how awesome this is. I've been using one for a while. Buttons feel fantastic. I only wish that it had L+R buttons just for flexibility.