For more information, visit Panasonic's SD page . You will need an adapter to use the SD cards with the GameCube. Nintendo built slots for the Mem Card 59 into the system, and created an adapter to use the expansive SD cards through the Mem Card slots. This makes the GameCube less expensive, and allows gamers to decide what they do and do not want to buy. Not so annoying.
Rumble adds alot to the experiance.
I've asked the staffer with the freshest domestic GameCube experience to answer you. It felt like it really added to the experience, which is the measure by which all such doo-hickeys should be tested against. Unlike 64's pack, it didn't numb my hands to it after a few rounds. It was still strong, noticable, and appropriately used. Felt a little stronger than the Dual Shock experiences I've had.