Just wanted to let everyone know the challenger lives up to the hype. I have cleaned for several years owning several home rental units. We have also ran a carpet cleaning service with a butler truckmount... I have always done HWE as my main method. After speaking with mark i was skeptical., However I'm glad i took the risk on learning more about vlm and opcc. It cleans the nasties to the lightly soild carpets with ease. HWE VLM they both have there place in the cc game. But at the end of the day customers like their carpets clean and Dry. It just makes sense to offer the service at a premium price. It all boils down to dollars and cents. Bottom line I give it a