Harvey
I use an extracta scrubba 13" power wand and its great.
Pubs, Residential everything except low profile office carpets as there it tends to jump about a lot and doesnt extract off the carpet.
Pre Spray, agitate etc. then set up the scrubba, one pass job done and that includes heavily soiled restaurant carpets as well.
I find the carpets are a lot dryer also.
If I have a lounge diner or a large lounge to do in a house i will use it. If it is a small loung with a fair bit of furniture i use the wand.
Cheers
Mark