I'm very happy with this product. The only drawback is that the velcro strap (a crucial part of the arm brace system) interferes slightly with a right handed grip when the brace is folded and stowed. I also have gigantor sized hands, so maybe it's me...
Workmanship and quality are both top notch. This is a fantastic option for anyone who wants to drop a Glock into a B&T USW-G chassis without having to go through SBR nonsense.