Haven't used it and wouldn't, as I actually enjoy cleaning my car and don't consider washing it using the safe 2 (or 3) bucket method a chore.
Also, it must be difficult to get to the backs of the wheels and into all the nooks and crannies using a waterless spray, whereas with a good set of conventional washing gear, this isn't a problem.
I wonder if these waterless products contain some form of fillers to mask swirls? It would be interesting to see what the condition of the paintwork is like if on a car cleaned with a waterless cleaner if the paintwork was stripped of all protection ready for polishing.