I have a Kimber Pro-Carry (ST-AL) and 2 Pro-Carry HDs (all ST 1 carry, 1 Range).
Here is my take on things.
If I need a pistol (I prey not) it will be the worst of all situations. And when I have to use it, I want every advantage I can get.
#1 An all steel gun is easier to shoot than Aluminum-frame gun.
#2 The all steel gun will hold up heavy shooting better.
#3 A Top Of The Line Holster and belt does more for carry comfort than 7oz. ever will.
#4 It's cheaper.
#5 Some Pistol Smiths will not do some work on an Aluminum gun.
I'll be the first to admit, the Aluminum guns are nice to carry, But I don't carry for the sake of carrying. I carry for the worst of all scenarios, and I'll willingly accept 7oz. of Steel for the advantage it may give me if needed.
7 oz.s isn't worth the possible loss of my Wife, children, myself, or others if that 7 oz.s could have made the difference. I admit the chances are small, but they are real. And I'll gladly carry that 7 oz.s just because of that small chance.
Besides It is easy to get use to, and you don't notice it in a good Belt Holster.