[john martin]

https://www.facebook.com/ashbyscleaningequipment/videos/943767595760974/


Not something absolutely necessary ... but nice to have the option .    Would be nice if u get the the 6.6 version

[cleanability]

Enlighten me why you would want less suction 

Chris

[cleanability]

I take it thats what swapping between series and parallel changes

[john martin]

Enlighten me why you would want less suction 

Chris

you mean less suction in parallel ?   true
well , when the wand is on the carpet , the operational suction will end up pretty similar in both series or parallel .  So having the ability to switch is not necessary as such , there might be certain carpets where wand contact is not ideal so one may out perfor the other on some particular carpet or wand type .
From a machine sales point of view it might be a good move . Those who might be looking into the whole series vs parallel thing can have both without deciding .