i testing only the qt4 flavor, the measurement are good, the probhlem are integration related, some freedesktop implementations are not just as spected..
in numbers, are so close and equal to openbox, better inclusively due less features (openbox can handle desktop management very basic and menu also), due eggwm does not handle any desktop and menu management are very more cheat rather that openbox and any other (in qt4)
i cannot test qt5 for now due i not using the wheeze debian machine (its not at my job, its in another office)