I've been involved in plenty of these forum discussions about the 1911 for duty use. I have never understood why someone would choose a low-capacity, relatively complicated pistol when you have bulletproof high-capacity modern designs like the M&P available.
Having had more of an opportunity to play with 1911s lately, I absolutely get it, I really do. I still don't know if I'd choose one, but I think I'd feel okay with a relatively high-dollar, quality-built one like a Colt XSE, Dan Wesson Valor, or Springfield TRP.
It astonishes me how comfortable the platform is, how amazing the trigger is, and how naturally it points. You might only get 7+1 or 8+1, but I feel like I could do a lot of damage with 8 or 9 rounds in a platform that inherently easy to shoot. Get a quality one and run it enough to make you feel okay about reliability with ball-profile JHPs like the Remington Golden Saber, and I can see a convincing argument for the platform.
Beretta PX4; 92FS; 92S; 8040G | Sig Sauer SP2022; P6 | Glock G19 Gen4; G23 Gen3| Colt Python 4"; 1968 Detective Special 2"| Smith & Wesson M642-1 | Ruger LCP; 10/22 | Daniel Defense M4V1 | Remington 870 | Alpine M1 Carbine | Steyr M1895 |1943 Izhevsk Mosin M91/30 | Walther PPS