I've had a couple of them and it all boils down to your personal expectations.
No, they aren't as much fun as a PPSh 41.
But, they are a lot of fun, especially when they come with the 50 round drum.
The first one I owned was about as accurate as an off the shelf low end Ruger 10-22, but much heavier.
The second one was a surprise. It shot several different makes of 22lr into consistent 1 inch groups at fifty yards.
They're a fun plinking rifle, but they go through a box of ammo very quickly.
We were playing around with a few of them at the range and one of the fellows demonstrated his "quick fire" technique.
We counted his rpm rate using the "tap" method, where you use a pen or pencil to tap a dot onto a sheet of paper for every shot you hear, while another person times the number of seconds it took to empty a fifty round drum.
Very crude and certainly not definitive but this fellow was getting off over 200 rpm.
Accuracy was of course non existent.