Agree ... I was fighting that carpet and I was soaked with sweat when done. Carpet was heavily soiled.They were renting a machine and cleaning it themselves. AC was on, but not low enough.
I usually only do 1-2 CGD jobs a month and most of the time a wand is ok but this month I did 5 CGD jobs 4 HWE and 1 VLM. I'm close to buying the Flex Star Head from Magic Wand.
Get the Mytee Flex Star head on your T Rex, you'll not regret it. As @OxiFreshGuy said, $600 is nothing. It'll save you time, energy, your body, and do a much better job on CGD.