I was wondering if I choose to play with a friend, is it server based for the MP game or is it hosted by the one who invites the other
The guy who invite the other guy become host i believe.
then does that mean if both had infinity they could both use it?
I guess so. Try it out 
im willing to, anybody else have it that is willing to try
Could have tried it with you, but my internet is slow where im at.
I dont have the game downloaded, i could start the download but you have to wait 30 min to an hour i guess
yea i had to download it also, and my internet died last night so couldnt finish it till this morning
thats about same speed mine downloads at, my speed is supposed to be higher but tops out at 5