Probably the best feature of the 80 and 150 levels is the fact that you get the prototype cards. Which means that NONE of the backer heroes will be included. So when the actually release is out, me (and any other backer at those levels) will have the option to play with the generic or specific heroes.
So if you want to completely eliminate the worry just pledge a lot of money! ^.^
So if you want to completely eliminate the worry just pledge a lot of money! ^.^