I have done a bit of research and it does seem there are various qualities of this film and good and bad fitters-if you are interesed go here as they seem to be the best Http://www.xpeleu.com/why-paintshield.jsp and have a quick look.
I have found the guy on the RSOC BB and will have a look at his car at a show this year and will then make my mind up-fingers crossed as I am fed up painting the front of my car every few years