Hi @jk,
I purchased my CFTBL hologram from Pinball Dreams in October of 2013. After almost 7 years it still looks bright green and is very clear and detailed.
Even though they are out of stock of the hologram at PPS, you can buy direct from Pinball Dreams.
The URL below details the making of the new PD CFTBL hologram if you are interested in the process.
https://pinside.com/pinball/forum/topic/creech-holo-part#post-2703133
Gord