Giant is coming out with dual sided PM on their higher end road bikes this year as a standard feature. Specialized is starting to put them on as well; IIRC theirs were developed in conjunction with 4iiii (whereas Giant were developed in house). The Cannondale model of supplying bikes with the PM installed and then wanting to upcharge to activate it seems like a loosing play.... I'd give the LBS a stinkeyed look if they wanted to add $500+ on the tab of a nice bike to "activate" something that was already installed.