The original NES controller is legendary - but the sharp edges can hurt a bit while playing and the DPad and Buttons feel a bit too hard compared to controllers these days.
The Cadet Premium Controller fixes both these issues. It has flattened edges which makes it more comfortable and the DPad doesn't need as much force, but still has a good tactile feedback.
Thanks to the similar form compared to the NES controller, it still feels like playing NES - but more comfortably.
If you're looking for a new NES controller, you certainly won't make a bad choice with this one.
The controller works both with European and US consoles as well as various NES-Clone systems.