I remember there being a problem with the bolt locking all the way forward. I'm not sure if they had a recall but I know that there were warnings out there about it.
That being said, I've seen them for sale at plenty of places and I know a lot of people do t have problems with them. I wanted one but decided it wasn't worth the risk for something with a poor reputation and possible safety hazard.
The 9mm version sounds cool, but any safety concerns would just be amplified with a larger round. I'd have to sit back for a while and read some reviews and let them improve on it before I felt it was worth going for.