For concealed carry it seem a little big. I have never carried one so I can't say for sure. It looks nice. I was over at a local sporting good store with a friend and he was looking at one. The price seems very reasonable.
The Halo sights are awesome they are very quick and accurate. Also you can keep both eyes open during shooting and just follow the mark on your target. Fantastic weapon sighting technology.
A Dull knife is always better than a broken knife.
Those Colt Defenders are nice. If I'm going to carry something something small & light, I'll carry my Kahr. If I want to carry a 1911, I have my Para Ordnance LW LTC (Basically a LW Commander).
BTW, did your Dad have any problems with his new Colt? Sometimes, 1911 models with barrels less than 4 1/4" "can" be problematic.
"Use human means as though divine ones didn't exist, and divine means as if there were no human ones." Baltasar Gracian