I think that even if the Semmerling LM-4 was cheaper than my R9S Stealth, I’d stick with the R9S!
Lighter, more rounds on board, and it’s semi-auto.
I can respect the design of the Semmerling LM-4, but it’s still rather odd, kind of like the Webley Fosbery, MBA Gyrojet Rocket pistol, or the turn of the Twentieth Century Mars Automatic pistols.