ok to answer a few questions, im sure the theifs dont look at the windows when they are about to steal a car, but as Matty 31 said they cant rid of parts as easily with it on there.
next, the size is very small would not get in the way if it was a show car, but defiantly a good idea if your car is a daily and you leave it at shops and that, but would prob not bother if its a show car and only a show car. so when you go out to your car next have a look on the glass that you got now and look for the NISSAN writing and under neath that i think it says Tempalite or Templex or something similar, its the same size as those etchings..
And hey its only 40 bucks and then 10 bucks for every car that gets it done goes towards SAU as a donation.
any more questions feel free