But effective lack of explanation

Product top to plug gamecube pad on her computer, fully functional for 1 player but not for 2. Lack of explanation from the seller. There is an other adapter 4 ports black and drivers are not compatible, be sure to choose the reference on the PC051 MayFlash site for this two-port adapter, otherwise windows will send an error message to install.
As said in the commentary, the drivers will be required to operate the vibration and also the analog buttons R and L, the "triggers". Without driver, the joystick is still supported for the main features (at least on Windows 7), you will be the qualibrer with the system calibration tool "Device and Printer" / "Devices and printer ".
Another dark spot and not least, analog sears operate ONLY PORT 2 !!! On port 1, the sears are binary and there is no landing is unplayable because too sensitive to be used as a standard button. Others also encountered the problem (with official also handles) [...]
it comes from the adapter manufacturer's will may be, it is impractical for a second player and it is sorely lacking in explanations, I almost return the equipment before falling on the correct link .. No patch either from a view to correct the problems.
Overall it is a good product but if you want to take full advantage of a second joystick with functional sears, you will need a second adapter. If you're playing alone, go for it.