Hi, I installed the drivekey a couple of days ago, works great! Installation was quiet easy, just slide the brown end of the connector a little outwards, so you can connect the ribbon cable. Don't need any force. It is a little different as stated on the website (using a hinge).The additional ribbon is for a jtag programmer. You can attach another ribbon cable, so that you can reach the drivekey on the outside to reprogramm the chip if needed. I let this ribbon exit the wii at the usb bus. Take care to put some insulation tape on the drivekey, so it cannot get damaged (shortcut) by the metal plate of the chassis
Every game I dropped in so far worked great, no lag whatsoever. Also getting in the system menu was no problem. Moving the arrow in the system menu was initially weird, however it turned out you can direct the arrow using the buttons on the wii itself.