Loads of people on here like it, can't imagine Flash making something that would be bad for the paintwork!
http://www.tyresmoke.net/ubbthreads/showflat.php/Cat/1,2,12,15,22,25,26,27,7/Number/381008/page/0/fpart/1/vc/1
This bloke bought this ionic rince thing :
He said :
"Haven't tried the Flash product, but recently acquired a filter thingy from Ionic Systems.
I was a bit sceptical beforehand as it's effectiveness, but it was absolutely superb. The paintwork looked stunning with a deep bright lustre and there was not a single water stain to be seen.
I'm even looking forward to washing her again. "
http://www.ionicsystems.com/cars/home/index.htm