No offence, but I disagree ...
The Concept One was (Is) an amazingly good cleaner. I am kicking myself even as I type because I found a nice model at a thrift shop that I didn't pick up and they priced it at $25.00. I'm going back Monday, and if it is still there, it is coming home with me. It will need spa treatment, but when I'm done with it, it will be like new. I will post before and after pictures.