I was on one of the "DE" first person servers:
-No server crash or client crash throughout the 2 hours I played. Did not encounter any players to check how PVP performed.
-Server performance was good, did not experience any lag.
-Enjoyed it very much, it was immersive, zombies everywhere and I felt they were a threat, was trying to avoid them at all costs.
-Died to zombies from having to shoot my gun at VMC because I could not "flee/sprint" due to plate carrier. This may need some tweaking as I felt quite punished. Not sure about it yet...
Twitch streamer "Sacriel" gave some great ideas on how to help stamina, ideas like how energized and hydrated you are affects how much stamina you can have, I would understand not being energized or hydrated would punish you if you have a plate carrier...I would recommend having a chat with him, he gives great feedback!