Review on Siemens QF130AN Neutral Circuit Breaker by Mark Patterson

Seems like a good switch but for heaven's sake Siemens - if it's a completely different mounting system why give it the exact same name as the QF130A switch , but added with a letter? "N" means "NOT"? It has a flange on the back that connects to the neutral wire on certain types of Siemens boxes. This flange keeps it from snapping into a standard Siemens box in my five year old house. Basically, if your GFCI switches are currently pigtailed, this switch will not work. It's a bit frustrating not realizing this until after the switch box has been disassembled, the power turned off and the incoming wires blocked. A complete waste of time.