Top positive review
Gets the job done quite nicely
on March 1, 2014
First off, the negatives. The button mapping is a little schizophrenic. The A, B and C buttons are mapped to 3, 2 and 6 respectively. The X, Y and Z buttons are mapped to 4, 1, and 5 respectively. The mode and start button are mapped to 9 and 10. The D-Pad is set as a Digital Joystick, which works fine. You'll notice that buttons 7 and 8 are not used. There is no way to use them.
Also, the D-pad is a little bit wonky, but that's more an issue with the original Mega Drive controller it's trying to mimic rather than with this reproduction. Just bear that in mind.
The good bits:
Works great. Tried it with the Sega Mega Drive Collection on Steam as well as a few different 3rd party emulators like Fusion and Gens and it works just as you'd expect. The device works just fine right out of the box with Windows 7 with Plug and Play. No setup or calibration required.
My only real complaint is it's size. It's based on the smaller model Japanese Mega Drive controller rather than the larger US one. Not really a big deal though.