I have gone through two sets of the Peltor/3Ms. When they work, they work pretty good. When they go sour, they crash pretty quick. Frustrations with chasing any type of repair/warranty. Just bought 2 sets of the Otto Micros.
The Otto is a different animal for sure than the Peltor/3Ms but I think I am going to like them at least as good or better. The way they cycle through a sharp impulse noise and back to normal is noticeably more delayed on the return part but will not be an issue.
I found that the Skull Screw plugs I was using on the 3Ms will fit onto the Otto set. My ear canals are big and that made these way more workable. Only a few weeks on the Ottos so far so not a real track record to report yet. I do think the Otto company would be more responsive to issues or warranty if needed.
./