User blog comment:Fall 50 cal./Black Ops = Crap?/@comment-173.65.124.79-20110104123230

The only perk I "don't like" would be Marathon; because you only take advantage of the Pro when you do buy the pro... You go from sprinting longer, to unlimited; how do you benefit from both if you have the pro??

The answer: you don't; and Marathon pro is the only perk like that...