hi mate,
I've had the very first Z to have Paintshield in the country (others had had Armourfend).
After 2 years of having just the bumper done (IIRC it was £240 ish) after 2 attempts by the inexperienced authorised installer in Stockport, I am actually going down to Gratham to see Tom tomorrow morning. Since they saw my car @ JAE 2005 and weren't happy with the install, they'll do it again FOR FREE! Now that's what you call Customer Service.
I'll be having everything else done too, as they sent me some freebie bits which I had never had the chance to do. I'll also be having my front lip done, after my previous one chipped badly!
I highly recommend the product, and wish I had had the bonnet done from the beginning too, as it's now chipped to death, unlike the bumper!