I have it on my Sand coloured +8... you can't see it.
I had it on a yellow sports car and it was awful - you could see it very easily. I think it was badly applied.
In my relatively limited experience of it, I would say - it's a bit colour dependent. Secondly if it has to fold anywhere, it's going to collect dust. My 8 is pretty much flat panels of the stuff and therefore there are no edges to catch dirt.
I wonder sometimes about the point of waxing the protected paint - there doesn't seem much point. If the paint underneath is spotless and waxed, then I guess that's enough.
