From what I've seen shooting them through a cylinder choke...they are a novelty at best and a waste of money at the worst.
if you're use to shooting off the shelf slugs and buckshot you can tell a big difference between those and the PDX-1 stuff (recoils more than a .410 should out of a shotgun)
Needless to say they aren't my cup of tea,I had a friend tell me about the extractor being blown after feeding his 500E a steady diet of the PDX-1.
The patterns from my tests weren't anything to write home about either.
I've had better luck with the federal loads.