I had 4 of them at one point or another starting with the first gen.
I have since sold all of them but they were a riot as others have stated but I had issues with all 4 at various times running them supressed.
Some issues were mag related, some was just the nature of blow back operated designs... Wayyy dirty. The newest gen has a slightly better feedramp geometry but I still struggled to get subsonic 147s to feed 100% out of them.
Supersonic supressed they all ran about 80% of time. I had one that refused to eat ANY hollow points period suppressed or loud.
Unsuppressed they all ran like a top with the exception of the one with hp's.
Trigger leaves something to be desired and honestly didn't think the hbi trigger spring upgrade was worth it... Still sucked. Ak safety is a must or at least a right side delete.
With 115 gr ball they just run.
Just my experience