1. I've used them, a few thousand, every one went bang in the 9MM and .40 S&W rounds I loaded with them.
2. There is something different about them. They fit into the primer pocket just fine. The issue I've had with them is they will not turn over (bottom down) in the Lee hand priming tools I use. If they turn upside down when dropping them out fo the box you can shake the tray all you want and they will not turn over. Put some CCIs or Federals in the primer tray and shake it and those turn over (you might have to turn over one of them if it's in a congested area of the tray with primers all around it). It's like there's something different about the top edges of the primer cup.
I just boght 2,000 Tula small rifle primers today. $21 per thousand. If they'd had more I'd have bought more.
I don't have a progressive press.