I have been happy with mine.
Swapped the factory flash hider for a Surefire Warcomp that has the proper metric threading (not sure off the top of my head) and have used a SOCOM Mini in it. It ran fine the handful of times I shot it suppressed with the factory locking piece.
I don't shoot it suppressed very often because it balances well with the 12" barrel and the suppressor just makes it front heavy. This being "off balance" seems more noticeable on the Z43P than on an AR with a similar barrel length due to the light weight collapsible stock on the Zenith, maybe a fixed stock would make this better.
I'm glad I bought it and enjoy shooting it but acknowledge it is a fun gun to shoot at the range and not a social gun because the AR platform is more ergonomic and I simply shoot that better.