I can empirically say about SCCY is that they back up their product. Had a customer come in with an SCCY which had jammed open. It was quite dirty as well. I was able to dislodge the slide, and disassembled for cleaning. When I pulled the receiver out of the ultrasonic, I found the receiver had split completely on one side of the magwell and half way on the other side. It was so dirty that you couldn't see the splits when assembled.
I contacted the company and they completely replaced the firearm. Sent the old one back, sure enough, the company sent a brand new firearm.