I've got one of the earlier models before the engineering revisions. I have the new 6 port gas plug but based on their new product announcement video, there is a revised plug that is supposed to be better for preventing short stroking. I've ran around 900 rounds through mine so far and it's gotten better with use.
Initially, it was tearing cartridge rims off almost every round and making it very frustrating to shoot. After 500 rounds it has smoothed out quite a bit. One ripped rim per 200 rounds, suppressed (sandman k) at lowest gas setting. I was initially using really crappy milsurp ammo so that was probably 40% of the cause. Switching to the 6 port plug alleviated a decent amount of the ripped rim failures. Still have a few hundred rounds of the misc milsurp ammo to go through.
The rear pin walks out about 1/4" during firing but stops right there and goes no further. I've seen some with fractured receiver tabs where that same pin locks in place. I haven't noticed obvious damage yet. Disconcerting to me, I check it every mag and push it back in as necessary. I'm giving it its first year and enough ammo to find the rest of the quirks in it so hopefully they all get fixed at once when I send it in for warranty.
It is very gassy suppressed, that didn't change with the new gas port. Enough so that my nose burns from the smell and I get a streak of black starting at my jawline and going halfway down my neck. The picatinny rail on the gas block is high burn hazard. Even with my scope mounted over it, I occasionally touch the side of it when moving it.
I haven't noticed any polymer failures yet but I'm certainly not saying it's impossible. I check the weapon regularly for failures of any kind I can think of because I don't trust it quite yet.
My thoughts, $2500 is a lot to spend on something that is not 100%. I had extra money and decided to try my luck with this purchase. As a range toy, it's pretty damned fun to shoot. I don't notice excessive recoil with it either suppressed, unsuppressed or braked.
I don't leave home with this rifle without a cleaning rod to knock out a ripped-rim case.
I won't be selling it except to upgrade to a newer/significantly improved MDR revision that cannot be retro-fitted into my rifle
The trigger is pretty good for a bullpup semi-auto. Waaaaay better than the AUG, but that's not setting a high bar.
Someday... MAYBE... this particular rifle will be G2G for hunting level reliability.
If the SHTF, I've got other .308's that are the go to's for reliability.
I'm no expert though so take this all with a grain of salt.