I just bought one. It deionizes the rinse water (and the soap) and sheets the water off, so the vehicle dries with no spots. I've only used it once, but I'm happy so far. It saves a lot of time and distress.

Is anyone else using it?

 

I wouldn't use the wash part but, for some people I'm sure it's great...

I am attracted, however, by the filter system. As simple as it is, it sure seems to make sense to me...

RP