Does anyone know about how good these are?

http://carcustomz.com/osc/dodge-dodge-c-3_557.html

 

Looks like precut window tint. I'd save about 20 bucks and just go to Walmart and buy some. A razor blade and heat gun will help shape it to the light. I've seen people use this method but don't know from first hand experience how well it will hold up.

 

I have some friends that did it but I don't know how long it's gonna hold up.