Not sure this counts but I did get a chance to shoot one of these last week. It was a lot of fun but I'm still not use to shooting full auto. The 9mm conversion he had on it made it so that it only kicked about as much as the full auto 30 carbine I was also shooting that day. Next time I'm going to see if he can bring out his PPSH-41 in 7.62x25 just to make a comparison. I might have to drop some cash that day because the 7.62x25 surplus is getting hard to find. Thats probably why he put the 9mm conversion on it.
http://www.youtube.com/watch?v=0Rca15SGXPI