From one old cop to another, you are going to love your new 340PD.
Well, except if you shoot full house 158 gr magnums in it. The first time that I did that, I seriously thought that I had broken a bone in my hand. I now shoot the Speer 135gr Gold Dot .357 magnum Short Barrel load. It is specifically made for the short barrels, and I have posted elsewhere my experience with this load and confidence in it.
Fully loaded, including the pocket holster that I use, it weighs less than a pound, and in my right front jeans pocket I don't even notice the weight, and no one has ever noticed the gun.
Oh, yeah, I never use a brush on my tI cylender either. Just a patch and a mild cleaning soulotion...I have used the Shooters Choice that you mention...it cleans up very easily, but no harsh chemicals or metal brushes are needed.
Best Regards, Les