Was delivered as described the USB adapter and a mini-CD, the drivers contained therein are only necessary for the vibration. This feature was not so interesting for me, so I have not tested yet.
For vibration-free use, it was only necessary to plug the adapter into the USB port, and connect a controller. Everything was immediately automatically detected and set up by WinXP SP3. Under Control Panel -> Game Controllers were immediately 2 gamepads set ready and even calibrated all right. All the buttons worked properly. To use the analog sticks on the gamepad, you have on the PS2 controller only "Analog" key, and already works also without problems. The "analog" LED on the gamepad is properly addressed.
In summary, I can only say that the port is working much better than expected, and the function is also flawless! GREAT ITEM!