I have a full size model that I've put several hundred rounds through.
It functions fine, I've had no stoppages.
Accuracy is mediocre, probably due to the fact that the barrel looks like it was rifled with a dull file, very crude machining on the bore.
Trigger was pretty horrid, took it apart and surprise surpise... there were no machined surfaces on the trigger or sear or disconnector. These parts are castings and other than the hammer hoods they hadn't even taken a file to them! Anyway, I re-cut all the angles and stoned the hammer and sear. Trigger is fine now, but it was several hours work.
For what I have in the gun, it's "okay".
It's by no means a quality firearm, but for a truck "beater" gun it's fine.