Tested on Windows 7 64bit.
Contrary to what the ad says and the official website, drivers have needs to be installed for the correct operation of the vibration and triggers. Not really plug & play then. The rest works without driver.
The drivers are available on a mini-CD supplied with the module.
If you have deleted or lost the CD: [...]
The setting of the triggers must be done manually as dolphin (clik right instead of left click):
Appaeil: DINPUT / 0 / USB GamePad
L: Button 4
A: Button 5
L Analog Axis Xr + (200/500 power)
R Analog: Axis Yr + (200/500 power)
Setting the vibration must be on "Sine" and / or "Ramp". The other options are dolphin crash.
The rest can be set to automatic detection (clik left).
Ability to play two controllers simultaneously with 1 adapter.
The easy open package.
USB cable long enough (2m)
The only negative I found was that the GameCube controller ports are mounted upside down. Too bad for an adapter that looks good workmanship.
PS: attention, emulating a gamecube game requires at least one i5 (i7 recommended)