To be honest, I use them when I don't want to throw away anything good. Mainly when I have to throw over water where I can't retrieve them. I picked up a bunch of PLS's on ebay a while back. They are in near perfect condition. The molds I got were:1.2, 1.3, 1.5, and 1.7. They still fly great! At $3 a disc I didn't feel I could go wrong.