Although there's a lot of steam behind the CZ 75 (which is sexy). I can relate from personal experience when I used an M11 as a "sidearm" for a few outdoor and indoor games it was with moderate success. It provided me with the ability to lay down a good volume of fire while I moved to better cover to bring my primary back online, and was fairly accurate in semi auto fire. I did however have considerable difficultly finding a suitable method of carry and eventually sold it and picked up a WA 1911 (this was a long long time ago) which served me well for quiet some time.
Not sure if you considered it but my m11 was a blast.