Generally the opinion of pax pellets is they aren't worth the material they are made from, they struggle to group smaller than the box they come in and the hardness of the material used by some designs may not be allowed to be shot at metal targets. But you do find the odd person that has found they suit their barrel. Often very odd.
Their use in target shooting seems to be on par with the amount of good group pics posted.
I tried their defiants. They certainly were. They defied every attempt I made to get them to group.