Almost everything the same! Except that in the 5000 series no automatic detection of the toothbrush essays is more available and the parent mount failed unfortunately somewhat spartan. Furthermore, now the SmartGuide in white instead kept in discreet blue! With regard to the papers so you are now bound to manually take always the right choice! Unfortunately, this is a bit annoying when polishing attachment. Because it turns the toothbrush from short to rinse around mouth, then you have to manually press the appropriate polishing mode when switching on again. So why had this detail can not take over from the 9900?