It's a shame that the RD is apparently cleaning almost as well as the pro wand.
Some customers may think that apart from the width of the cleaning path, there isn't a massive difference. And if they haven't got some blue marks etc, then will get a similar result - and will think 'I'll be happy with that tbh' and thus go and hire a RD....saving money.
The RD needs to show hardly any difference, splashes everywhere and generally a bit of a mess - and a dull/gloomy shot like they do for other adverts.
Only saying!