When I did my taillights on my Cirrus, I loved how they looked from far away, but when you get closer, they didn't have the same shine as regular plastic had.
Also, the light output was DRASTICALLY decreased during the daytime... it's pretty difficult to see when you're braking or turning.
During the night, light output was just ok. wasn't real bright like I wanted. In the end, I used paint thinner and removed everything.
I think someone was asking about legality of niteshade... it's not legal, so be careful.