I carried one concealed (I was a Fed Agent - except for SRT we didn't have uniforms) for years. Then one Christmass, Santa brought me a 4566, which I also carried for years. Frankly, if you live in a hot climate, there is nothing that isn't a pain in the ass to carry concealed. Accept it. You're going to have to wear something to cover it.
The 4566 was a tad shorter than the 4505, but even under a leather flight jacket (winter in Nevada), either gun left me conscious of the fact that if I moved just right, holster would show (I can't stand anything but a P-7 stuck inside my pants).
I shot one as well (or badly - you know how THAT goes) as the other. I probably used the 4506 just because it was a present from my parents. Both weapons are so reliable and dependable it's totally a toss up. As opposed to "throw up?"
My advice would be, assuming you like the weapon, go for it. In those days, 1911's became "pistola non grata" in my Agency, and as DA .45's come and go, especially if you like steel as opposed to plastic, I know of none better.
For warmer weather, all I did was throw an old military BDU blouse on with the sleeves rolled up. That'll cover anything. Then just grab a handfull of questionably awarded Vietnam era war medals and throw them at some war memorial somewhere and you'll probably even get elected President.
As the guys said, can having another .45 REALLY hurt? I kept all of three of mine (two 4506's and one 4566) just because they really are excellent weapons (at least I think so).