We have had polymer notes since the late 80s. They do last a long time and they are hard to forge. The biggest problem with them is if you screw em up and shove em in your pocket, they tend to unfold and can be lost. They are very slippery and you have to make sure they are shoved in ya pocket properly as they have a lot less resistance than the old paper notes so tend to work their way out.
We make them for heaps of other countries too, as well as coins. Just about all of the sth pacific uses money we made. We also make the polymer notes for Dallas`s mates in Mexico!
When the first plastic not came in, I got a heap from the Reserve bank on day one. Headed up the bush the next day and no one would take em because they hadnt actually seen another. So it was toy money to the pubs. I swapped a few with some more intelligent bushies. Later on, they were recalled. They tended to fade in a "hot wash" from memory. They became collectors items and are now worth plenty, but I didnt keep any.