I have a 650. Heat is good @ 230-240, single or dual wand. It will be HOT at brass points. No suction loss with dual carpet wands. Ran 9 50' lines single, and 5/4 split with no loss.
Only problems come from deciphering the codes from the computer, but with time you get familiar. Some spots are tight to work on (belts esp.)
It's a beast of a machine. I love it.
