I see there's a MegaLink upgrade in there as well. If there are two "black boxes" the phone cord plugs into, this would be great for someone who wants to link two 5's together.
I have a couple of 6's that have the MegaLink and it is a great upgrade being able to play head-to-head against another person.
$20 is an absolute steal for this kit, especially since the older MegaLinks are next to impossible to find!
Bill