Tell them to send you a keg of Weihenstephaner instead.
I've had some Grafenwalder Pils in the past...I recall it more as something to wash away your supper on a hot summer night but nothing special.
And in form of a keg for home use, I'm not sure if I would be happy with those.
I've had one of those Heineken Kegs and suprisingly it tasted even worse then what comes in bottle
HunterICX