phase 2 offers some pretty significant differences, that vary between the models you mentioned. imo they all look much better with the clean front and top mounted control. it is also a much more sophisticated control. when different options (such as stereo or tv) are added they instantly are added to the menus. air controls and diverters also got a new look. the new phase also added some cool led lighting. because the prodigy has no pillows or moto massage this isn't as big of a deal for it. the vanguard and aria take the most radical shift, having an all plastic (abs i think) frame. am i forgetting anything guys?